blk-mq updates, V3

[Christoph Hellwig]

The first two patches are unchanged from the last two iterations of
the series.

Patches 3 and 4 are new: 3 is a preparation for 4 and other future work,
and patch 4 makes sure that drivers don't have to implement special
workarounds for the magic flush request.  Patch 5 is an updated version
of the earlier init/exit_request versions which should make everyone
happy now as there are no special NULL hardware contexts or negative
request numbers due to patch 4 sorting out the flush_rq mess.

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