scsi-disk: Implement rerror option
This implements the rerror option for SCSI disks. It also includes minor changes to the write path where the same code is used that was criticized in the review for the changes to the read path required for rerror support. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>
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