Fix horizon in mcp virtual labs

Change-Id: I13ec1e2386c777fa65231937a2082a049fc6c273
diff --git a/classes/cluster/os-aio-contrail/openstack/proxy.yml b/classes/cluster/os-aio-contrail/openstack/proxy.yml
index a4ea571..c0688c2 100755
--- a/classes/cluster/os-aio-contrail/openstack/proxy.yml
+++ b/classes/cluster/os-aio-contrail/openstack/proxy.yml
@@ -5,6 +5,7 @@
 - system.nginx.server.proxy.openstack_vnc
 - system.nginx.server.proxy.openstack_web
 - system.salt.minion.cert.proxy
+- cluster.os-aio-contrail.openstack.dashboard
 - cluster.os-aio-contrail
 parameters:
   _param: