Add "local" custom log flag to control logging of
connection state machine transitions for local connections.
Suppress other logs for local connections.
Do not suppress "Controller disconnect" message.
This message is useful for debugging cases when listening connections
are unintentionally closed.
Merge into master from pull request #155:
Add "local" custom log flag to control logging of connection state machine transitions for local connections. (https://github.com/floodlight/indigo/pull/155)