Adding OpenConfig YANG models.

Change-Id: I0a2fdd5826e80933cf4b9ae939ff3051acec02aa
diff --git a/modules.defs b/modules.defs
index 9fe09ac..fba723d 100644
--- a/modules.defs
+++ b/modules.defs
@@ -222,6 +222,7 @@
 
 MODELS = [
     '//models/huawei:onos-models-huawei-oar',
+    '//models/openconfig:onos-models-openconfig-oar',
     '//models/openroadm:onos-models-openroadm-oar',
     '//models/l3vpn:onos-models-l3vpn-oar',
     '//models/microsemi:onos-models-microsemi-oar'