Adding application level dependencies between dependent models.

Change-Id: I3b37da04c962094852d47d24e49287ce30648016
diff --git a/models/l3vpn/BUCK b/models/l3vpn/BUCK
index f858b4c..8098905 100644
--- a/models/l3vpn/BUCK
+++ b/models/l3vpn/BUCK
@@ -2,8 +2,13 @@
     '//models/common:onos-models-common',
 ]
 
+APPS = [
+    'org.onosproject.models.common',
+]
+
 yang_model(
     app_name = 'org.onosproject.models.l3vpn',
     title = 'L3VPN YANG Models',
     deps = COMPILE_DEPS,
+    required_apps = APPS,
 )