Add support for CephMgr in the ceph-ansible workflow
Add support for CephMgr in the ceph-ansible workflow

The upgrade of Ceph to Luminous requires a new daemon, ceph-mgr,
to be deployed with every ceph-mon. This submission adds support
for the deployment of ceph-mgr via ceph-ansible.

Change-Id: I3645c6c3f68fcefc93fa8699796ba8892aa946c8
Partially-Implements: blueprint ceph-luminous

openstack/tripleo-common,openstack/tripleo-common