fix repos for mcp11 contrail

Change-Id: I207ea5bf9d04098ea156fd76becc11eac0fc6f80
diff --git a/classes/cluster/virtual-mcp11-contrail/openstack/init.yml b/classes/cluster/virtual-mcp11-contrail/openstack/init.yml
index 0edfa04..a83c082 100755
--- a/classes/cluster/virtual-mcp11-contrail/openstack/init.yml
+++ b/classes/cluster/virtual-mcp11-contrail/openstack/init.yml
@@ -1,6 +1,6 @@
 parameters:
   _param:
-    openstack_version: newton
+    openstack_version: ocata
     apt_mk_version: nightly
     openstack_region: RegionOne
     admin_email: root@localhost