eventpoll: Fix dependency check

In the case when one eventpoll in polled by another eventpoll,
we should wait till the polled epoll is opened. So, as the stage
FLE_RESTORED is after FLE_OPEN, it's also OK.

travis-ci: success for eventpoll: Fix dependency check
Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>