Watchdog shuts down servers if it takes too long to reload data packs

See title, it's pretty self-explanatory.

If you use a reload command, and have big data packs to load (thus taking a long time), watchdog will actually shut down the server, while it is actually making progress in loading files.

Obviously it's easier to test on slower computers.

Steps to reproduce:

1. Set up a server.
2. Change the watchdog shutdown timer to a low value (eg 5)
3. Use /reload.
4. Observe the server being considered crashed.