[VOL-1034, VOL-1035, VOL-1037] This commit consists of:
1) Implementation of inter-adapter communication using flows
as proxy message between an ONU and its parent OLT.
2) Update the protos to reflect the inter-adapter message structure
3) Cleanup the ponsim adapters to removed unsued references and
general cleanup.

Change-Id: Ibe913a80a96d601fed946d9b9db55bb8d4f2c15a
diff --git a/adapters/ponsim_olt/__init__.py b/adapters/ponsim_olt/__init__.py
index b0fb0b2..4a82628 100644
--- a/adapters/ponsim_olt/__init__.py
+++ b/adapters/ponsim_olt/__init__.py
@@ -1,4 +1,4 @@
-# Copyright 2017-present Open Networking Foundation
+# Copyright 2018-present Open Networking Foundation
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.