blkverify: Implement bdrv_co_preadv/pwritev/flush
This enables byte granularity requests for blkverify, and at the same time gets us rid of another user of the BDS-level AIO emulation. The reference output of a test case must be changed because the verification failure message reports byte offsets instead of sectors now. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com>
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