fix(sysctl): Increase watchdog timeouts and reboot delay after panic

The default watchdog is 10 seconds, we are using 5 which is perhaps a
bit too aggressive. Swing the other way and use 15 seconds.

The current fast reboot after panic is not useful considering we do
nothing to try to gather panic information after rebooting right now.
Probably wouldn't work on many VM platforms even if we tried anyway.
Rebooting after 60 seconds gives users a chance to see the error log
before the VM vanishes.

Enabling panic after hard and soft lockups is already enabled but I've
added it here so the settings are all in one place. Alternatively we
could remove these panic settings from here and set them all in the
kernel config. Any opinions? Either way one place is better than two.