Hooked YANG GUI to the build process.

Change-Id: Idae3c8b55707a017918926b66e190d861bada3a9
diff --git a/modules.defs b/modules.defs
index 7395ade..b6c71d9 100644
--- a/modules.defs
+++ b/modules.defs
@@ -173,6 +173,7 @@
     '//apps/scalablegateway:onos-apps-scalablegateway-oar',
     '//apps/castor:onos-apps-castor-oar',
     '//apps/yms:onos-apps-yms-oar',
+    '//apps/yms/gui:onos-apps-yms-gui-oar',
     '//apps/ofagent:onos-apps-ofagent-oar',
     '//apps/mappingmanagement:onos-apps-mappingmanagement-oar',
     '//apps/config:onos-apps-config-oar',