Init script ties serf agent to current shell lifetime

[thieman]

The agent needs to be started with nohup or, ideally, using a more comprehensive tool like start-stop-daemon. Currently, trying to start the service over SSH reports that the service was successfully started but it is actually immediately killed when the SSH session ends.

[Alukardd]

Yes, start-stop-daemon is a good way, but as I can see serf agent work fine with this init script too.