We were luckely on built-in tests, because always
AIO pages were present, and, thus, they are dumped.
But AIO pages are not guaranteed to be present
in common case.

This patch makes AIO pages are dumped certanly.
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>