Further tweak the changes made in r233709. The kernel doesn't permit

sleeping from a swi handler (even though in this case it would be ok), so
switch the refill and scanning SWI handlers to being tasks on a fast
taskqueue.  Also, only schedule the refill task for a CMCI as an MC# can
fire at any time, so it should do the minimal amount of work needed and
avoid opportunities to deadlock before it panics (such as scheduling a
task it won't ever need in practice).  To handle the case of an MC# only
finding recoverable errors (which should never happen), always try to
refill the event free list when the periodic scan executes.

MFC after:	2 weeks

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