don't start radosgw service from puppet

radosgw can't properly initialize until the Ceph cluster is populated
with enough OSD nodes, and we already have radosgw restart as a
post-deployment action in Astute.

Closes-Bug: #1390649
Change-Id: If7eaa9371f498f04876b84a4b6420440af26a9ff
Merge "don't start radosgw service from puppet" into stable/5.1