files: Print symbolic meaning of file restoring status

 |	Restoring fd 5 (state -> create)
 |		Create fd for 5
 |			Going to dup 5 into 5
 |	Restoring fd 0 (state -> receive)

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>