aio: extract aio_dispatch() from aio_poll()

aio: extract aio_dispatch() from aio_poll()

We will need to loop over AioHandlers calling ->io_read()/->io_write()
when aio_poll() is converted from select(2) to g_poll(2).

Luckily the code for this already exists, extract it into the new
aio_dispatch() function.

Two small changes:

 * aio_poll() checks !node->deleted to avoid calling handlers that have
   been deleted.

 * Fix typo 'then' -> 'them' in aio_poll() comment.

Signed-off-by: Stefan Hajnoczi <[email protected]>
Reviewed-by: Laszlo Ersek <[email protected]>
Message-id: 1361356113[email protected]
Signed-off-by: Anthony Liguori <[email protected]>