VOL-3419: Replicate voltha flows in openolt agent
Pass the following additional information in the Flow message for agent to replicate the flow
- voltha flow_id
- symmetric voltha_flow_id (where applicable)
- flag to indicate whether the flow is to be replicated
- when flow is to be replicated, the pbit to gemport map
- Bump major version to 4.0.0 since this change is NOT backward compatible

This will enable the agent to do the flow replication if necessary.

Change-Id: I9e3d43b5b24721e352ccd8a2011b4ad0a83eaf69
diff --git a/VERSION b/VERSION
index 1cf8253..fcdb2e1 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-3.4.6
+4.0.0