Enable objects versioning for Ceph RadosGW

We enabled objects versioning for Swift in the Newton release [1],
this change aligns the RGW configuration to have the same behavior.

1. https://review.openstack.org/#/c/384616/

Change-Id: I6dbdd0eac52cceaad9ee74d707591540cf3f5ef1
Co-Authored-By: Pritha Srivastava <prsrivas@redhat.com>
Related-Bug: 1632215

deployment/ceph-ansible/ceph-base.yaml

@@ -348,6 +348,7 @@ resources:
                   rgw_keystone_implicit_tenants: 'true'
                   rgw_keystone_revocation_interval: '0'
                   rgw_s3_auth_use_keystone: 'true'
+                  rgw_swift_versioning_enabled: 'true'
                 - {get_param: CephConfigOverrides}
           ntp_service_enabled: false
           generate_fsid: false