Fixes: fab join_cluster aborts for adding redhat node to ha cluster

Enabling join_cluster if the contrail_internal_vip is present in testbed.

Change-Id: Ibbf4e92e1d0d4cd776d5d12bab38c4b21ba93b73
Closes-Bug: 1654151

fabfile/tasks/ha.py

@@ -1070,6 +1070,7 @@ def join_ha_cluster(new_ctrl_host):
             execute('increase_limits_node', new_ctrl_host)
             execute('join_orchestrator', new_ctrl_host)
 
+    if get_contrail_internal_vip():
         if new_ctrl_host in env.roledefs['database']:
             execute('setup_database_node', new_ctrl_host)
             execute('fix_zookeeper_config')