Add backup pillar to ceph rgw model

Change-Id: I9f82832375c4b8b6d8e3020cc6c84446b71b3ce8
Related: PROD-19420
diff --git a/classes/cluster/virtual-mcp-pike-dvr-ceph-rgw/openstack/control.yml b/classes/cluster/virtual-mcp-pike-dvr-ceph-rgw/openstack/control.yml
index 922bcf4..8ad6fe3 100644
--- a/classes/cluster/virtual-mcp-pike-dvr-ceph-rgw/openstack/control.yml
+++ b/classes/cluster/virtual-mcp-pike-dvr-ceph-rgw/openstack/control.yml
@@ -14,6 +14,7 @@
 - system.glusterfs.client.volume.keystone
 - system.glusterfs.server.volume.glance
 - system.glusterfs.server.volume.keystone
+- system.glusterfs.server.volume.backup
 - system.glusterfs.server.cluster
 - system.glance.control.cluster
 - system.nova.control.cluster