* Dont export multicast route upon VRF delete

Ideally upon VRF delete control-node implictly deletes all the
paths added by agent in particular VRF, in problematic scenario
after VRF unsubscribe was done agent used to send a route delete
for multicast route, resulting in control-node closing the channel.

Change-Id: I440fa9bc561bf50229a7134122093d487b93bfb7
Closes-bug: #1716356

src/vnsw/agent/controller/controller_export.cc

@@ -335,6 +335,12 @@ void RouteExport::MulticastNotify(AgentXmppChannel *bgp_xmpp_peer,
     State *state = static_cast<State *>(route->GetState(partition->parent(), id_));
     bool route_can_be_dissociated = MulticastRouteCanDissociate(route);
 
+    if (marked_delete_ && state) {
+        route->ClearState(partition->parent(), id_);
+        delete state;
+        state = NULL;
+        return;
+    }
     //Handle withdraw for following cases:
     //- Route is not having any active multicast exportable path or is deleted.
     //- associate(false): Bgp Peer has gone down and state needs to be removed.