This commit consists of:
1) Yang annotations to the protobuf definitions.  These annotations, when
   added to the relevant proto files in Voltha,  allow us to convert
   the voltha proto schemas into Yang schemas without the need to change the
   model definitions.
2) Update to the Yang parser to handle the above annotations
3) Some initial work on the netconf GET RPCs (work in progress)
4) Cleanup

Change-Id: I5e4f4217850f0beb1c41aca1b2530a41e4f8a809
diff --git a/ofagent/agent.py b/ofagent/agent.py
index 73864e0..29434d2 100644
--- a/ofagent/agent.py
+++ b/ofagent/agent.py
@@ -25,7 +25,7 @@
 from common.utils.asleep import asleep
 from of_connection import OpenFlowConnection
 from of_protocol_handler import OpenFlowProtocolHandler
-from ofagent.protos.openflow_13_pb2 import ChangeEvent
+# from ofagent.protos.openflow_13_pb2 import ChangeEvent
 
 log = structlog.get_logger()