Moving huawei YANG model to /models, also removing the redundant YANG which are redundant now.

Change-Id: I10bf58aa5172807d892173c358a75de1fb206d5a
diff --git a/modules.defs b/modules.defs
index e03e8f2..9d0b53e 100644
--- a/modules.defs
+++ b/modules.defs
@@ -201,7 +201,7 @@
 ]
 
 MODELS = [
-    '//models/demo:onos-models-demo-oar',
+    '//models/huawei:onos-models-huawei-oar',
     '//models/openroadm:onos-models-openroadm-oar',
     '//models/l3vpn:onos-models-l3vpn-oar',
 ]