Isolate IETF models in OpenConfig to own bundle

Change-Id: I15fff358582dd7b361d015c2d30c981a703fd1be
diff --git a/models/openconfig/BUCK b/models/openconfig/BUCK
index 60f7572..5905528 100644
--- a/models/openconfig/BUCK
+++ b/models/openconfig/BUCK
@@ -1,5 +1,10 @@
 COMPILE_DEPS = [
     '//lib:CORE_DEPS',
+    '//models/ietf:onos-models-ietf',
+]
+
+APPS = [
+    'org.onosproject.models.ietf',
 ]
 
 yang_model(
@@ -7,4 +12,5 @@
   title = 'OpenConfig YANG Models',
   custom_registrator = True,
   deps = COMPILE_DEPS,
+  required_apps = APPS,
 )