ceph ha mising single_address fix

Change-Id: I66d3f5bdf5188a4ac30a5a6c1a023d919373e940
diff --git a/classes/cluster/ceph-ha/ceph/init.yml b/classes/cluster/ceph-ha/ceph/init.yml
index 6bfb3db..a2600a9 100644
--- a/classes/cluster/ceph-ha/ceph/init.yml
+++ b/classes/cluster/ceph-ha/ceph/init.yml
@@ -22,6 +22,8 @@
     ceph_cfs_node01_hostname: cfs01
     ceph_cfs_node01_address: 172.16.10.97
 
+    single_address: ''
+
     ceph_cluster_fsid: a619c5fc-c4ed-4f22-9ed2-66cf2feca23d
     ceph_mon_keyring: AQAnQIhZ6in5KxAAdf467upoRMWFcVg5pbh1yg==
     ceph_admin_keyring: AQBHPYhZv5mYDBAAvisaSzCTQkC5gywGUp/voA==