tcp: Schedule tcp socket for repair-off with proper fd

The fd in -> open callback is temporary (the files restoring
engine will re-open one under some other fd). But since we
add this fd to future repair off, this off will fail working
on wrong fd.

Move scheduling for repair-off into port-open where the corrent
fd is known.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>