Add nova:compute:networking:contrail pillar to contrail labs

Change-Id: Icb364ff914c595c65a555496249f92335fbc0abe
diff --git a/classes/cluster/os-ha-contrail-40/openstack/compute.yml b/classes/cluster/os-ha-contrail-40/openstack/compute.yml
index b30902b..4dc427e 100644
--- a/classes/cluster/os-ha-contrail-40/openstack/compute.yml
+++ b/classes/cluster/os-ha-contrail-40/openstack/compute.yml
@@ -66,6 +66,7 @@
         topics: "notifications"
         notify_on:
           state_change: vm_and_task_state
+      networking: contrail
   opencontrail:
     common:
       network: