Revert "dm: only run the queue on completion if congested or no requests pending"

Revert "dm: only run the queue on completion if congested or no requests pending"

This reverts commit 700f4d7be97039f3e4359ac5bafdfc315ded5a3e.
(Resolved a conflict during revert due to commit 75f401f6db that came
after)

This revert is motivated by a couple failure reports on request-based DM
multipath testbeds:
1) Netapp reported that their multipath fault injection test under heavy
   IO load can stall longer than 300 seconds.
2) IBM reported elevated lock contention in their testbed (likely due to
   increased back pressure due to IO not being dispatched as quickly):
   https://www.redhat.com/archives/dm-devel/2015-July/msg00057.html

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org # 4.1+