block/raw-posix: implement .bdrv_detach/attach_aio_context()
Drop the assumption that we're using the main AioContext for Linux AIO.
Convert the Linux AIO event notifier to use aio_set_event_notifier().
The .bdrv_detach/attach_aio_context() interfaces also need to be
implemented to move the event notifier handler from the old to the new
AioContext.
Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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