This commit consists of:
1) Ability for the netconf client to retrieve schemas metadata from
   the netconf server
2) Ability for the netconf server to retrieve specific yang schema from
   the netconf server
3) Netconf says Happy New Year 2017

Change-Id: I6552224707607ca6cc1397f2fbf193503bb116a3
diff --git a/netconf/nc_rpc/ext/get_voltha.py b/netconf/nc_rpc/ext/get_voltha.py
index 0c51e9a..5b004e7 100644
--- a/netconf/nc_rpc/ext/get_voltha.py
+++ b/netconf/nc_rpc/ext/get_voltha.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 #
-# Copyright 2016 the original author or authors.
+# Copyright 2017 the original author or authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -18,20 +18,18 @@
 import structlog
 from netconf.nc_rpc.rpc import Rpc
 import netconf.nc_common.error as ncerror
-from netconf.constants import Constants as C
-from netconf.utils import filter_tag_match
 from twisted.internet.defer import inlineCallbacks, returnValue
 import dicttoxml
-from simplejson import dumps, load
 
 log = structlog.get_logger()
 
 
 class GetVoltha(Rpc):
-    def __init__(self, request, grpc_client, session):
-        super(GetVoltha, self).__init__(request, grpc_client, session)
+    def __init__(self, request, request_xml, grpc_client, session, capabilities):
+        super(GetVoltha, self).__init__(request, request_xml, grpc_client, session)
         self._validate_parameters()
 
+
     @inlineCallbacks
     def execute(self):
         log.info('get-voltha-request', session=self.session.session_id,
@@ -64,11 +62,5 @@
             self.rpc_response.node = ncerror.BadMsg(self.rpc_request)
             return
 
-        if self.params and not filter_tag_match(self.params[0], C.NC_FILTER):
-            self.rpc_response.is_error = True
-            self.rpc_response.node = ncerror.UnknownElement(
-                self.rpc_request, self.params[0])
-            return
-
         if not self.params:
             self.params = [None]