We should not try to explicitely install qemu-kvm-rhev

When qemu-kvm and qemu-kvm-rhev are both available for installation, qemu-kvm-rhev will always be installed because it is set to obsolete qemu-kvm.
Therefore, we don't need to try and detect if it's available and explicitely install it - puppet-nova will install qemu-kvm and, if it is available, yum will select qemu-kvm-rhev.

Example:
[root@n32 ~]# yum search kvm
Loaded plugins: fastestmirror, priorities
centos-ceph-hammer | 2.9 kB 00:00:00
centos-openstack-mitaka-test | 2.9 kB 00:00:00
centos-qemu-ev | 2.9 kB 00:00:00
(1/3): centos-openstack-mitaka-test/x86_64/primary_db | 3.0 MB 00:00:00
(2/3): centos-ceph-hammer/7/x86_64/primary_db | 30 kB 00:00:00
(3/3): centos-qemu-ev/7/x86_64/primary_db | 17 kB 00:00:00
Loading mirror speeds from cached hostfile
 * base: mirror4.ci.centos.org
 * extras: mirror4.ci.centos.org
 * updates: mirror4.ci.centos.org
====================================================================================================================================================== N/S matched: kvm ======================================================================================================================================================
libvirt-daemon-kvm.x86_64 : Server side daemon & driver required to run KVM guests
pcp-pmda-kvm.x86_64 : Performance Co-Pilot (PCP) metrics for KVM
qemu-kvm-tools.x86_64 : KVM debugging and diagnostics tools
qemu-kvm-tools-ev.x86_64 : KVM debugging and diagnostics tools
qemu-kvm.x86_64 : QEMU is a FAST! processor emulator
qemu-kvm-common.x86_64 : QEMU common files needed by all QEMU targets
qemu-kvm-common-ev.x86_64 : QEMU common files needed by all QEMU targets
qemu-kvm-ev.x86_64 : QEMU is a FAST! processor emulator
virt-v2v.x86_64 : Convert a virtual machine to run on KVM

  Name and summary matches only, use "search all" for everything.
[root@n32 ~]# yum -y install qemu-kvm
Loaded plugins: fastestmirror, priorities
Loading mirror speeds from cached hostfile
 * base: mirror4.ci.centos.org
 * extras: mirror4.ci.centos.org
 * updates: mirror4.ci.centos.org
Package qemu-kvm is obsoleted by qemu-kvm-ev, trying to install 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64 instead
Resolving Dependencies
--> Running transaction check
---> Package qemu-kvm-ev.x86_64 10:2.3.0-31.el7_2.7.1 will be installed
--> Processing Dependency: qemu-kvm-common-ev = 10:2.3.0-31.el7_2.7.1 for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: qemu-img-ev = 10:2.3.0-31.el7_2.7.1 for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: seabios-bin >= 1.7.5-1 for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libseccomp >= 1.0.0 for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: glusterfs-api >= 3.6.0 for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: sgabios-bin for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: seavgabios-bin for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libspice-server.so.1(SPICE_SERVER_0.8.3)(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libspice-server.so.1(SPICE_SERVER_0.8.2)(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libspice-server.so.1(SPICE_SERVER_0.8.1)(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libspice-server.so.1(SPICE_SERVER_0.6.0)(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libspice-server.so.1(SPICE_SERVER_0.12.4)(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libspice-server.so.1(SPICE_SERVER_0.12.3)(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libspice-server.so.1(SPICE_SERVER_0.12.2)(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libspice-server.so.1(SPICE_SERVER_0.11.2)(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libspice-server.so.1(SPICE_SERVER_0.10.4)(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libspice-server.so.1(SPICE_SERVER_0.10.3)(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libspice-server.so.1(SPICE_SERVER_0.10.2)(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libspice-server.so.1(SPICE_SERVER_0.10.1)(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libspice-server.so.1(SPICE_SERVER_0.10.0)(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: librdmacm.so.1(RDMACM_1.0)(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libpulse.so.0(PULSE_0)(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libpng15.so.15(PNG15_0)(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libibverbs.so.1(IBVERBS_1.1)(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libibverbs.so.1(IBVERBS_1.0)(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libgfapi.so.0(GFAPI_3.5.0)(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libgfapi.so.0(GFAPI_3.4.0)(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: ipxe-roms-qemu for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libusbredirparser.so.1()(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libusb-1.0.so.0()(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libtcmalloc.so.4()(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libspice-server.so.1()(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libseccomp.so.2()(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: librdmacm.so.1()(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: librbd.so.1()(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: librados.so.2()(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libpulse.so.0()(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libpng15.so.15()(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libpixman-1.so.0()(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libiscsi.so.2()(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libibverbs.so.1()(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libglusterfs.so.0()(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libgfxdr.so.0()(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libgfrpc.so.0()(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Processing Dependency: libgfapi.so.0()(64bit) for package: 10:qemu-kvm-ev-2.3.0-31.el7_2.7.1.x86_64
--> Running transaction check
---> Package glusterfs-api.x86_64 0:3.7.1-16.0.1.el7.centos will be installed
--> Processing Dependency: glusterfs-client-xlators = 3.7.1-16.0.1.el7.centos for package: glusterfs-api-3.7.1-16.0.1.el7.centos.x86_64
--> Processing Dependency: glusterfs = 3.7.1-16.0.1.el7.centos for package: glusterfs-api-3.7.1-16.0.1.el7.centos.x86_64
---> Package glusterfs-libs.x86_64 0:3.7.1-16.0.1.el7.centos will be installed
--> Processing Dependency: rsyslog-mmjsonparse for package: glusterfs-libs-3.7.1-16.0.1.el7.centos.x86_64
---> Package gperftools-libs.x86_64 0:2.4-7.el7 will be installed
--> Processing Dependency: libunwind.so.8()(64bit) for package: gperftools-libs-2.4-7.el7.x86_64
---> Package ipxe-roms-qemu.noarch 0:20130517-8.gitc4bce43.el7_2.1 will be installed
---> Package libibverbs.x86_64 0:1.1.8-8.el7 will be installed
---> Package libiscsi.x86_64 0:1.9.0-6.el7 will be installed
---> Package libpng.x86_64 2:1.5.13-7.el7_2 will be installed
---> Package librados2.x86_64 1:0.94.5-1.el7 will be installed
--> Processing Dependency: libboost_thread-mt.so.1.53.0()(64bit) for package: 1:librados2-0.94.5-1.el7.x86_64
--> Processing Dependency: libboost_system-mt.so.1.53.0()(64bit) for package: 1:librados2-0.94.5-1.el7.x86_64
---> Package librbd1.x86_64 1:0.94.5-1.el7 will be installed
---> Package librdmacm.x86_64 0:1.0.21-1.el7 will be installed
---> Package libseccomp.x86_64 0:2.2.1-1.el7 will be installed
---> Package libusbx.x86_64 0:1.0.15-4.el7 will be installed
---> Package pixman.x86_64 0:0.32.6-3.el7 will be installed
---> Package pulseaudio-libs.x86_64 0:6.0-7.el7 will be installed
--> Processing Dependency: libsndfile.so.1(libsndfile.so.1.0)(64bit) for package: pulseaudio-libs-6.0-7.el7.x86_64
--> Processing Dependency: libxcb.so.1()(64bit) for package: pulseaudio-libs-6.0-7.el7.x86_64
--> Processing Dependency: libsndfile.so.1()(64bit) for package: pulseaudio-libs-6.0-7.el7.x86_64
--> Processing Dependency: libasyncns.so.0()(64bit) for package: pulseaudio-libs-6.0-7.el7.x86_64
--> Processing Dependency: libXtst.so.6()(64bit) for package: pulseaudio-libs-6.0-7.el7.x86_64
--> Processing Dependency: libX11.so.6()(64bit) for package: pulseaudio-libs-6.0-7.el7.x86_64
--> Processing Dependency: libX11-xcb.so.1()(64bit) for package: pulseaudio-libs-6.0-7.el7.x86_64
--> Processing Dependency: libSM.so.6()(64bit) for package: pulseaudio-libs-6.0-7.el7.x86_64
--> Processing Dependency: libICE.so.6()(64bit) for package: pulseaudio-libs-6.0-7.el7.x86_64
---> Package qemu-img-ev.x86_64 10:2.3.0-31.el7_2.7.1 will be installed
---> Package qemu-kvm-common-ev.x86_64 10:2.3.0-31.el7_2.7.1 will be installed
---> Package seabios-bin.noarch 0:1.7.5-11.el7 will be installed
---> Package seavgabios-bin.noarch 0:1.7.5-11.el7 will be installed
---> Package sgabios-bin.noarch 1:0.20110622svn-4.el7 will be installed
---> Package spice-server.x86_64 0:0.12.4-15.el7 will be installed
--> Processing Dependency: libjpeg.so.62(LIBJPEG_6.2)(64bit) for package: spice-server-0.12.4-15.el7.x86_64
--> Processing Dependency: libjpeg.so.62()(64bit) for package: spice-server-0.12.4-15.el7.x86_64
--> Processing Dependency: libcelt051.so.0()(64bit) for package: spice-server-0.12.4-15.el7.x86_64
---> Package usbredir.x86_64 0:0.6-7.el7 will be installed
--> Running transaction check
---> Package boost-system.x86_64 0:1.53.0-25.el7 will be installed
---> Package boost-thread.x86_64 0:1.53.0-25.el7 will be installed
---> Package celt051.x86_64 0:0.5.1.3-8.el7 will be installed
--> Processing Dependency: libogg.so.0()(64bit) for package: celt051-0.5.1.3-8.el7.x86_64
---> Package glusterfs.x86_64 0:3.7.1-16.0.1.el7.centos will be installed
---> Package glusterfs-client-xlators.x86_64 0:3.7.1-16.0.1.el7.centos will be installed
---> Package libICE.x86_64 0:1.0.9-2.el7 will be installed
---> Package libSM.x86_64 0:1.2.2-2.el7 will be installed
---> Package libX11.x86_64 0:1.6.3-2.el7 will be installed
--> Processing Dependency: libX11-common >= 1.6.3-2.el7 for package: libX11-1.6.3-2.el7.x86_64
---> Package libXtst.x86_64 0:1.2.2-2.1.el7 will be installed
--> Processing Dependency: libXi.so.6()(64bit) for package: libXtst-1.2.2-2.1.el7.x86_64
--> Processing Dependency: libXext.so.6()(64bit) for package: libXtst-1.2.2-2.1.el7.x86_64
---> Package libasyncns.x86_64 0:0.8-7.el7 will be installed
---> Package libjpeg-turbo.x86_64 0:1.2.90-5.el7 will be installed
---> Package libsndfile.x86_64 0:1.0.25-10.el7 will be installed
--> Processing Dependency: libvorbisenc.so.2()(64bit) for package: libsndfile-1.0.25-10.el7.x86_64
--> Processing Dependency: libvorbis.so.0()(64bit) for package: libsndfile-1.0.25-10.el7.x86_64
--> Processing Dependency: libgsm.so.1()(64bit) for package: libsndfile-1.0.25-10.el7.x86_64
--> Processing Dependency: libFLAC.so.8()(64bit) for package: libsndfile-1.0.25-10.el7.x86_64
---> Package libunwind.x86_64 2:1.1-5.el7_2.2 will be installed
---> Package libxcb.x86_64 0:1.11-4.el7 will be installed
--> Processing Dependency: libXau.so.6()(64bit) for package: libxcb-1.11-4.el7.x86_64
---> Package rsyslog-mmjsonparse.x86_64 0:7.4.7-12.el7 will be installed
--> Running transaction check
---> Package flac-libs.x86_64 0:1.3.0-5.el7_1 will be installed
---> Package gsm.x86_64 0:1.0.13-11.el7 will be installed
---> Package libX11-common.noarch 0:1.6.3-2.el7 will be installed
---> Package libXau.x86_64 0:1.0.8-2.1.el7 will be installed
---> Package libXext.x86_64 0:1.3.3-3.el7 will be installed
---> Package libXi.x86_64 0:1.7.4-2.el7 will be installed
---> Package libogg.x86_64 2:1.3.0-7.el7 will be installed
---> Package libvorbis.x86_64 1:1.3.3-8.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

==============================================================================================================================================================================================================================================================================================================================
 Package Arch Version Repository Size
==============================================================================================================================================================================================================================================================================================================================
Installing:
 qemu-kvm-ev x86_64 10:2.3.0-31.el7_2.7.1 centos-qemu-ev 2.1 M
Installing for dependencies:
 boost-system x86_64 1.53.0-25.el7 base 39 k
 boost-thread x86_64 1.53.0-25.el7 base 57 k
 celt051 x86_64 0.5.1.3-8.el7 base 53 k
 flac-libs x86_64 1.3.0-5.el7_1 base 169 k
 glusterfs x86_64 3.7.1-16.0.1.el7.centos updates 422 k
 glusterfs-api x86_64 3.7.1-16.0.1.el7.centos updates 60 k
 glusterfs-client-xlators x86_64 3.7.1-16.0.1.el7.centos updates 732 k
 glusterfs-libs x86_64 3.7.1-16.0.1.el7.centos updates 322 k
 gperftools-libs x86_64 2.4-7.el7 base 272 k
 gsm x86_64 1.0.13-11.el7 base 30 k
 ipxe-roms-qemu noarch 20130517-8.gitc4bce43.el7_2.1 updates 559 k
 libICE x86_64 1.0.9-2.el7 base 65 k
 libSM x86_64 1.2.2-2.el7 base 39 k
 libX11 x86_64 1.6.3-2.el7 base 605 k
 libX11-common noarch 1.6.3-2.el7 base 162 k
 libXau x86_64 1.0.8-2.1.el7 base 29 k
 libXext x86_64 1.3.3-3.el7 base 39 k
 libXi x86_64 1.7.4-2.el7 base 40 k
 libXtst x86_64 1.2.2-2.1.el7 base 20 k
 libasyncns x86_64 0.8-7.el7 base 26 k
 libibverbs x86_64 1.1.8-8.el7 base 56 k
 libiscsi x86_64 1.9.0-6.el7 base 60 k
 libjpeg-turbo x86_64 1.2.90-5.el7 base 134 k
 libogg x86_64 2:1.3.0-7.el7 base 24 k
 libpng x86_64 2:1.5.13-7.el7_2 updates 213 k
 librados2 x86_64 1:0.94.5-1.el7 centos-ceph-hammer 1.7 M
 librbd1 x86_64 1:0.94.5-1.el7 centos-ceph-hammer 1.8 M
 librdmacm x86_64 1.0.21-1.el7 base 64 k
 libseccomp x86_64 2.2.1-1.el7 base 49 k
 libsndfile x86_64 1.0.25-10.el7 base 149 k
 libunwind x86_64 2:1.1-5.el7_2.2 updates 56 k
 libusbx x86_64 1.0.15-4.el7 base 50 k
 libvorbis x86_64 1:1.3.3-8.el7 base 204 k
 libxcb x86_64 1.11-4.el7 base 189 k
 pixman x86_64 0.32.6-3.el7 base 254 k
 pulseaudio-libs x86_64 6.0-7.el7 base 576 k
 qemu-img-ev x86_64 10:2.3.0-31.el7_2.7.1 centos-qemu-ev 783 k
 qemu-kvm-common-ev x86_64 10:2.3.0-31.el7_2.7.1 centos-qemu-ev 443 k
 rsyslog-mmjsonparse x86_64 7.4.7-12.el7 base 29 k
 seabios-bin noarch 1.7.5-11.el7 base 74 k
 seavgabios-bin noarch 1.7.5-11.el7 base 32 k
 sgabios-bin noarch 1:0.20110622svn-4.el7 base 7.1 k
 spice-server x86_64 0.12.4-15.el7 base 380 k
 usbredir x86_64 0.6-7.el7 base 44 k

Transaction Summary
==============================================================================================================================================================================================================================================================================================================================
Install 1 Package (+44 Dependent packages)