Add opencontrail_node_role parameter for contrail nodes

Use opencontrail_node_role parameter to perform one-shot
operations on cluster level.

Related-PROD: PROD-23789
Change-Id: I417316a41b85fa54e3eb0e82814c199026f495f2
diff --git a/opencontrail/control/control4_0.yml b/opencontrail/control/control4_0.yml
index 8572553..09b1e12 100644
--- a/opencontrail/control/control4_0.yml
+++ b/opencontrail/control/control4_0.yml
@@ -47,6 +47,7 @@
         region: ${_param:openstack_region}
         host: ${_param:openstack_control_address}
     control:
+      role: ${_param:opencontrail_node_role}
       config_only: true
       analytics:
         members: