This commit consists of:
1) Dockerizing the netconf server
2) Update proto2yang to support module imports
3) Provide a set of yang modules derived from the proto files in voltha.
   These files as well as the slight mmodifications to the proto files are
   provided in the experiments/netconf/proto2yang directory
4) Code to automatically pull proto files from voltha into the netconf server,
   compiles them and produce the yang equivalent files.
5) Add a getvoltha netconf API to provide voltha state information (basic at
   this time).  There is potential to make this generic once we experiment
   with additional APIs

Change-Id: I94f3a1f871b8025ad675d5f9b9b626d1be8b8d36
diff --git a/netconf/nc_rpc/base/close_session.py b/netconf/nc_rpc/base/close_session.py
index 43babb8..ce187cd 100644
--- a/netconf/nc_rpc/base/close_session.py
+++ b/netconf/nc_rpc/base/close_session.py
@@ -24,8 +24,9 @@
 
 class CloseSession(Rpc):
 
-    def __init__(self, rpc_request, rpc_method, session):
-        super(CloseSession, self).__init__(rpc_request, rpc_method, session)
+    def __init__(self, rpc_request, rpc_method, grpc_client, session):
+        super(CloseSession, self).__init__(rpc_request, rpc_method,
+                                           grpc_client, session)
         self._validate_parameters()
 
     def execute(self):