Add prometheus proxy to openstack environments

Change-Id: Ib6adfce06ca2da76f0f02f3d68ac6d3dcbee0daa
diff --git a/classes/cluster/virtual-mcp11-contrail/stacklight/init.yml b/classes/cluster/virtual-mcp11-contrail/stacklight/init.yml
index f2a2b65..e283639 100755
--- a/classes/cluster/virtual-mcp11-contrail/stacklight/init.yml
+++ b/classes/cluster/virtual-mcp11-contrail/stacklight/init.yml
@@ -1,5 +1,6 @@
 parameters:
   _param:
+    prometheus_control_address: ${_param:stacklight_monitor_address}
     heka_elasticsearch_host: ${_param:stacklight_monitor_address}
     elasticsearch_port: 9200
     stacklight_environment: ${_param:cluster_domain}