qemu-io: Use bdrv_drain_all instead of qemu_aio_flush
This is harmless as of today because I/O throttling is not used in
qemu-io, however as soon as .bdrv_drain handlers will be introduced,
qemu-io must be sure to call bdrv_drain_all().
Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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