stop scheduler on panic patches updated

[Andriy Gapon]

The patches can be found at the same locations:
head - http://people.freebsd.org/~avg/stop_scheduler_on_panic.diff
stable/8 - http://people.freebsd.org/~avg/stop_scheduler_on_panic.8.x.diff

Additionally, if you use a USB keyboard, then the following patch is required for
proper operation in post-panic environment:
http://people.freebsd.org/~avg/stop_scheduler_on_panic.usb.diff
The patch is the same for both head and stable/8.
It shouldn't hurt if you don't use USB devices or use other USB devices.

-- 
Andriy Gapon