[ONOS-4481] Integrate scalable gateway to openstackRouting

 - Modified openstack_routing to use scalable gateway application
 - Add GatewayNode Builder method

Change-Id: Ib12d52009eeb89ab59f01cafe794894aac80985e
diff --git a/apps/openstacknetworking/openstackrouting/BUCK b/apps/openstacknetworking/openstackrouting/BUCK
index b691ff9..da4f812 100644
--- a/apps/openstacknetworking/openstackrouting/BUCK
+++ b/apps/openstacknetworking/openstackrouting/BUCK
@@ -3,6 +3,7 @@
     '//core/store/serializers:onos-core-serializers',
     '//apps/openstackinterface/api:onos-apps-openstackinterface-api',
     '//apps/openstacknetworking/api:onos-apps-openstacknetworking-api',
+    '//apps/scalablegateway:onos-apps-scalablegateway',
 ]
 
 BUNDLES = [