PIM: contribute source port information to multicast store

Change-Id: Id154f5043ec1913c69de320d3bca3245585683aa

@@ -235,6 +235,8 @@ public class PimInterfaceManager implements PimInterfaceService {
             return;
         }
 
+        multicastRouteService.addSource(route, pimInterface.getInterface().connectPoint());
+
         routes.put(route, pimInterface);
     }