Fix overwrite for kubernetes images

Now uses overrides.yml instead of overwrite.yml

Change-Id: Ia16e8f1cb3c70261599dc4cf3fcce893442d8f24
diff --git a/classes/cluster/virtual-mcp11-k8s-contrail/infra/init.yml b/classes/cluster/virtual-mcp11-k8s-contrail/infra/init.yml
index 4cfe566..6ef0ebc 100644
--- a/classes/cluster/virtual-mcp11-k8s-contrail/infra/init.yml
+++ b/classes/cluster/virtual-mcp11-k8s-contrail/infra/init.yml
@@ -15,7 +15,7 @@
 - cluster.virtual-mcp11-k8s-contrail.kubernetes
 - cluster.virtual-mcp11-k8s-contrail.opencontrail
 - cluster.virtual-mcp11-k8s-contrail.stacklight
-- cluster.overwrite
+- cluster.overrides
 parameters:
   _param:
     # infra service addresses