Currently, for SCSI LUN_RESETs the target layer can only wait on
bio/requests it has sent. This normally results in the LUN_RESET
timing out on the initiator side and that SCSI error handler
escalating to something more disruptive.

To fix this, the following patches add a block layer helper and
callout to reset a request queue which the target layer can use
to force drivers to complete/fail executing requests.

Patches were made over Jens's block tree's for-next branch.

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