This commit consists of:
1) Yang annotations to the protobuf definitions.  These annotations, when
   added to the relevant proto files in Voltha,  allow us to convert
   the voltha proto schemas into Yang schemas without the need to change the
   model definitions.
2) Update to the Yang parser to handle the above annotations
3) Some initial work on the netconf GET RPCs (work in progress)
4) Cleanup

Change-Id: I5e4f4217850f0beb1c41aca1b2530a41e4f8a809
diff --git a/netconf/nc_rpc/ext/get_voltha.py b/netconf/nc_rpc/ext/get_voltha.py
index 271a20e..a083401 100644
--- a/netconf/nc_rpc/ext/get_voltha.py
+++ b/netconf/nc_rpc/ext/get_voltha.py
@@ -44,10 +44,8 @@
         # Invoke voltha via the grpc client
         res_dict = yield self.grpc_client.invoke_voltha_api(self.voltha_method_ref)
 
-        # res_dict = yield self.grpc_client.get_voltha_instance()
-
         # convert dict to xml
-        xml = dicttoxml.dicttoxml(res_dict)
+        xml = dicttoxml.dicttoxml(res_dict, attr_type=False)
         log.info('voltha-info', res=res_dict, xml=xml)
 
         root_elem = self.get_root_element(xml)