qemu-io: add aio read/write/flush commands
Add commands to exercise asynchronous reads/writes and to flush all outstanding aio commands. Commands to exercise aio cancellations will follow in a separate patch. Signed-off-by: NChristoph Hellwig <hch@lst.de> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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