Fix case where a machine crashes and won't restart.

sudo /etc/init.d/tron start
 * Starting tron  tron                                                                                                                                                                             Daemon was running as 20990. Remove PID file.

makes no sense - the computer knows the PID file is unused,
it should be able to remove it
Why? I don't understand why the _try_unlock exists in this code branch at all?