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: I4226233d02b70980c6b53518ae2d511b653ce2de
Depends-On: I3645c6c3f68fcefc93fa8699796ba8892aa946c8
Implements: blueprint ceph-luminous