Pull ceph.conf for cinder role

In a rare scenario of having cinder nodes (providing storage for Cinder LVM
backend) in an OpenStack environment configured to use Ceph RBD as backend for
Cinder volumes, cinder-volume on a cinder node would fail to connect to Ceph
because ceph.conf isn't there.

Change-Id: I1c4119fbfca3db5f234b18e1e03b7e31b971287e
Closes-Bug: 1319106
Merge "Pull ceph.conf for cinder role"