Sectors are marked dirty in the bitmap on AIO submission. This is wrong
since data has not reached storage.

Set a given sector as dirty in the dirty bitmap on AIO completion, so that
reading a sector marked as dirty is guaranteed to return uptodate data.

Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>