Add upgrade support for CephRGW service
Add upgrade support for CephRGW service

Implements minor upgrade of the ceph-radosgw service.

Change-Id: I4c064bf996ec6bb7eba41ab6384bd953a8ec920f
Partially-Implements: blueprint overcloud-upgrades-per-service

openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates