files: place the state POST_CREATE after the state RECV

It will be used for restoring epollfd.
Currently a transport fd may be added to epollfd.
epollfd should be populated, when all descriptors were already received.

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>