dm-3.16-fixes

. Fix DM multipath IO hang regression from 3.15 due to logic bug in
  multipath_busy.  This impacted cable-pull testing and also the ability
  to boot with IPR SCSI on a POWER8 box.

. Fix possible deadlock with deferred device removal by using a new
  dedicated workqueue rather than using the system workqueue.

. Fix NULL pointer crash due to race condition in dm-io's wake up code
  for sync_io by using a completion.

. Update dm-crypt and dm-zero author name following legal name change;
  this is important to Jana so I didn't see any reason to hold it back.
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