blkdebug: Implement bdrv_co_preadv/pwritev/flush
This enables byte granularity requests for blkdebug, and at the same time gets us rid of another user of the BDS-level AIO emulation. Note that unless align=512 is specified, this can behave subtly different from the old behaviour because bdrv_co_preadv/pwritev don't have to perform alignment adjustments any more. Signed-off-by: NKevin Wolf <kwolf@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com>
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