We want to avoid deadlock situations and right now if there is a process
running with the same PID that is not our process (e.g. after a reboot)
we might be waiting forever to run the cron again. So to make this
transparent to the user, we at least post a warning into the logfile.

- disabled database logging of sql reconnect errors, fixed #3974

- Implemented: FS#3110 - Turn monitoring module into cron jobs