VOL-1101: Implement a Twisted Python shim layer to interface with any KV store
- Moved methods get, list, put, delete, reserve, renew_reservation,
  release_reservation, and release_all_reservations from each of the
  implementation classes to the parent KVClient.
- Did not move method _op_with_retry because it invokes different
  target methods and handles different target exceptions, where
  the target is Etcd or Consul.

Change-Id: I7c5c06ab5d554e17b8f7658b9b11b22cb8e492d8
diff --git a/common/kvstore/kvstore.py b/common/kvstore/kvstore.py
index a7f7390..662b34d 100644
--- a/common/kvstore/kvstore.py
+++ b/common/kvstore/kvstore.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.