Fix virtual-mcp11-contrail model

This change makes sure that cluster_domain is taken from
classes/cluster/overrides.yml and not the local init.yml file.

Change-Id: I52c046ecfc06cd051bfa0092e500c4fb6043b639
diff --git a/classes/cluster/virtual-mcp11-contrail/infra/init.yml b/classes/cluster/virtual-mcp11-contrail/infra/init.yml
index 9140bd0..b6a6cc2 100755
--- a/classes/cluster/virtual-mcp11-contrail/infra/init.yml
+++ b/classes/cluster/virtual-mcp11-contrail/infra/init.yml
@@ -1,4 +1,8 @@
 parameters:
+  _param:
+    cluster_domain: virtual-mcp11-contrail.local
+    cluster_name: virtual-mcp11-contrail
+    infra_config_address: 172.16.10.100
   linux:
     network:
       host: