health: Logging message,module,action

That's much more easy to read log when all those information are
reported :

2014-04-16 11:06:45,458 DEBUG Sent ACK/NONE/NONE to ('127.0.0.1', 40470) (need_ack=False)
2014-04-16 11:06:48,058 DEBUG Sent MODULE/CPU/START to ('127.0.0.1', 40470) (need_ack=False)
2014-04-16 11:06:50,102 DEBUG Received MODULE/CPU/COMPLETED from ('127.0.0.1', 40470) (need_ack=False)