Add command line and config parameter --log_flow to control logging
of flow messages in contrail-vrouter-agent. Disabled by default.
Closes-Bug: #1353748
Change-Id: I8de39025727254535f819ab717ca0ea64a6bb69a
Merge "Add command line and config parameter --log_flow to control logging of flow messages in contrail-vrouter-agent. Disabled by default. Closes-Bug: #1353748 Change-Id: I8de39025727254535f819ab717ca0ea64a6bb69a" into R1.10