- Fix an uninitialized variable false warning in dm bufio

- Fix DM's passthrough ioctl support to be race free against an
  underlying device being removed.

- Fix corner-case of DM raid resync reporting if/when the raid becomes
  degraded during resync; otherwise automated raid repair will fail.

- A few DM multipath fixes to make non-SCSI optimizations, that were
  introduced during the 4.16 merge, useful for all non-SCSI devices,
  rather than narrowly define this non-SCSI mode in terms of "nvme".
  This allows the removal of "queue_mode nvme" that really didn't need
  to be introduced.  Instead DM core will internalize whether
  nvme-specific IO submission optimizations are doable and DM multipath
  will only do SCSI-specific device handler operations if SCSI is in
  use.
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