use specific ceph_conf resources to avoid dependency loop

Spaceship operator matching all ceph_conf resources creates a dependency
loop because it includes ceph_conf resources defined in ceph::radosgw
which in turn depends on ceph::conf.

Change-Id: I60773d1c419b2f1cbf5b5e54b74684cc66b986a9
Closes-Bug: #1400744
Merge "use specific ceph_conf resources to avoid dependency loop"