Can not attach volume to instance when iscsi multipath enabled

Steps:
1. Deploy environment of released MOS 7.0 (MirantisOpenStack-7.0.iso)
Settings:
Kilo on Ubuntu 14.04
1 controller, 1 compute, 1 cinder node.
Cinder LVM over iSCSI for volumes, Neutron VLAN, QEMU

2. SSH to compute node.
3. Configure "iscsi_use_multipath=True" in [libvirt] section of /etc/nova/nova.conf on compute node.
4. Then restart nova-compute service.
5. Create an instance.
6. Create volume and try to attach it to the instance.

CLI Output looks like volume attached succesfully:
# nova volume-attach instance 04fcb29e-76a2-4a32-b815-3fb7a30ad21c auto
+----------+--------------------------------------+
| Property | Value |
+----------+--------------------------------------+
| device | /dev/vdb |
| id | 04fcb29e-76a2-4a32-b815-3fb7a30ad21c |
| serverId | 0e3d20d0-c333-4539-ac8e-f6169f6ed412 |
| volumeId | 04fcb29e-76a2-4a32-b815-3fb7a30ad21c |
+----------+--------------------------------------+

# nova show instance output shows that no volume attached to specified instance:

| os-extended-volumes:volumes_attached | [] |

Also Horizon shows that volume is not attached to instance.

Fuel snapshot attached.

VERSION:
  feature_groups:
    - mirantis
  production: "docker"
  release: "7.0"
  openstack_version: "2015.1.0-7.0"
  api: "1.0"
  build_number: "301"
  build_id: "301"
  nailgun_sha: "4162b0c15adb425b37608c787944d1983f543aa8"
  python-fuelclient_sha: "486bde57cda1badb68f915f66c61b544108606f3"
  fuel-agent_sha: "50e90af6e3d560e9085ff71d2950cfbcca91af67"
  fuel-nailgun-agent_sha: "d7027952870a35db8dc52f185bb1158cdd3d1ebd"
  astute_sha: "6c5b73f93e24cc781c809db9159927655ced5012"
  fuel-library_sha: "5d50055aeca1dd0dc53b43825dc4c8f7780be9dd"
  fuel-ostf_sha: "2cd967dccd66cfc3a0abd6af9f31e5b4d150a11c"
  fuelmain_sha: "a65d453215edb0284a2e4761be7a156bb5627677"

Bug affects also MOS 7.0 MU1 package.
Updates repositories:
Centos for nailgun:
http://mirror.fuel-infra.org/mos-repos/centos/mos7.0-centos6-fuel/proposed/x86_64/
Ubuntu for cluster nodes:
http://mirror.fuel-infra.org/mos-repos/ubuntu/7.0/ mos7.0-proposed main restricted

Verified than current bug does not affect actual MOS 8.0 build for example on:
VERSION:
  feature_groups:
    - mirantis
  production: "docker"
  release: "8.0"
  openstack_version: "2015.1.0-8.0"
  api: "1.0"
  build_number: "114"
  build_id: "114"