PID   SID TT       COMMAND
26748 26748 ?        tty03
26749 26749 pts/2     \_ tty03
26750 26750 ?             \_ tty03

The second process has not a file descriptor for the ctl tty,
but this tty is opened in tty03.

Currently CRIU can not restore this test case correctly.

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