K 10
svn:author
V 7
attilio
K 8
svn:date
V 27
2011-09-04T13:07:02.426529Z
K 7
svn:log
V 587
Interrupts are disabled/enabled when entering and exiting the KDB context.
While this is generally good, it brings along a serie of problems,
like clocks going off sync and in presence of SW_WATCHDOG, watchdogs
firing without a good reason (missed hardclock wdog ticks update).

Fix the latter by kicking the watchdog just before to re-enable the interrupts.
Also, while here, not rely on users to stop the watchdog manually when
entering DDB but do that when entering KDB context.

Sponsored by: Sandvine Incorporated
Reviewed by:	emaste, rstone
Approved by:	re (kib)
MFC after:	1 week

END