Alexander Motin b7ff445ffa Reduce bufdaemon/bufspacedaemon shutdown time.
Before this change bufdaemon and bufspacedaemon threads used
kthread_shutdown() to stop activity on system shutdown.  The problem is
that kthread_shutdown() has no idea about the wait channel and lock used
by specific thread to wake them up reliably.  As result, up to 9 threads
could consume up to 9 seconds to shutdown for no good reason.

This change introduces specific shutdown functions, knowing how to
properly wake up specific threads, reducing wait for those threads on
shutdown/reboot from average 4 seconds to effectively zero.

MFC after:	2 weeks
Reviewed by:	kib, markj
Differential Revision:  https://reviews.freebsd.org/D33936
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