puppet-tripleo unit tests broken due to missing redis

https://review.openstack.org/#/c/566465/ dropped redis from p-o-i so it needs to be added to puppet-tripleo

http://logs.openstack.org/91/582991/1/check/puppet-openstack-unit-4.8-centos-7/8e3a86a/job-output.txt.gz#_2018-07-30_14_19_29_491655

2018-07-30 14:19:29.491366 | centos-7 | 1) tripleo::profile::base::database::redis on centos-7-x86_64 behaves like tripleo::profile::base::database::redis with step 2 on bootstrap node should configure redis
2018-07-30 14:19:29.491445 | centos-7 | Failure/Error: is_expected.to contain_class('tripleo::profile::base::database::redis')
2018-07-30 14:19:29.491459 | centos-7 |
2018-07-30 14:19:29.491488 | centos-7 | Puppet::PreformattedError:
2018-07-30 14:19:29.491655 | centos-7 | Evaluation Error: Error while evaluating a Resource Statement, Could not find declared class ::redis at /home/zuul/workspace/spec/fixtures/modules/tripleo/manifests/profile/base/database/redis.pp:110:5 on node centos-7-ovh-gra1-0001053280