Added scalable gateway app to BUCK app list

And fixed maven artifact ID to follow the convention

Change-Id: I700c93516d4c79a3b5b93e99138a593a569e52a1

@@ -142,6 +142,7 @@ APPS = [
     '//apps/openstacknode:onos-apps-openstacknode-oar',
     '//apps/cpman/app:onos-apps-cpman-app-oar',
     '//apps/xosclient:onos-apps-xosclient-oar',
+    '//apps/scalablegateway:onos-apps-scalablegateway-oar',
 ]
 
 APP_JARS = [

@@ -25,7 +25,7 @@
         <version>1.7.0-SNAPSHOT</version>
     </parent>
 
-    <artifactId>onos-scalablegateway</artifactId>
+    <artifactId>onos-app-scalablegateway</artifactId>
     <packaging>bundle</packaging>
 
     <description>ONOS Scalable Gateway applications</description>

@@ -71,6 +71,7 @@ APPS = [
   '//apps/openstacknode:onos-apps-openstacknode-oar',
   '//apps/cpman/app:onos-apps-cpman-app-oar',
   '//apps/xosclient:onos-apps-xosclient-oar',
+  '//apps/scalablegateway:onos-apps-scalablegateway-oar',
   '//apps/events:onos-apps-events-oar',
   '//apps/test/election:onos-apps-test-election-oar',
   '//apps/test/distributed-primitives:onos-apps-test-distributed-primitives-oar',