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/analytics.yml b/opencontrail/control/analytics.yml
index 6e56936..36781c2 100644
--- a/opencontrail/control/analytics.yml
+++ b/opencontrail/control/analytics.yml
@@ -33,6 +33,7 @@
       network:
         host: ${_param:opencontrail_control_address}
     collector:
+      role: ${_param:opencontrail_node_role}
       discovery:
         host: ${_param:opencontrail_control_address}
     database: