Move OS dashboard in OS HA Contrail lab and fix proxy

Change-Id: I60e8f076c446c2debc74353df95a4ad62b8aee09
diff --git a/classes/cluster/os_ha_contrail/openstack/dashboard.yml b/classes/cluster/os_ha_contrail/openstack/dashboard.yml
index 7c9602e..0c4cb38 100755
--- a/classes/cluster/os_ha_contrail/openstack/dashboard.yml
+++ b/classes/cluster/os_ha_contrail/openstack/dashboard.yml
@@ -3,7 +3,7 @@
 - system.linux.system.repo.mcp.openstack
 - system.linux.system.repo.mcp.extra
 - system.linux.system.repo.saltstack.xenial
-- system.horizon.server.single
+- system.horizon.server.cluster
 - system.horizon.server.plugin.contrail
 - system.horizon.server.plugin.overrides
 - cluster.os_ha_contrail