This commit consists of:
1) Parsing protobuf responses from Voltha into a dict which will also
   include the yang proto annotations
2) Converting a protobuf response into a yang-compatible XML format
3) Support for GET (no request params) for Voltha, VolthaInstance and VolthaInstances
4) Minor bug fixes
5) Testing done using the MG-Soft Netconf client

Change-Id: Ibb7f62a391e19b0240cc739919fccc689a316005
diff --git a/netconf/nc_rpc/rpc.py b/netconf/nc_rpc/rpc.py
index 5b579c9..bafc58e 100644
--- a/netconf/nc_rpc/rpc.py
+++ b/netconf/nc_rpc/rpc.py
@@ -21,14 +21,13 @@
 from lxml import etree
 import io
 
+
+
 class Rpc(object):
-    def __init__(self,rpc_request, rpc_method, voltha_method_ref,
-                 grpc_client, session):
-        self.rpc_request = rpc_request
-        self.rpc_method = rpc_method
+    def __init__(self, request, grpc_client, session):
+        self.request = request
         self.rpc_response = RpcResponse()
         self.grpc_client =  grpc_client
-        self.voltha_method_ref = voltha_method_ref
         self.session = session