tty: Drop sid/pgid test from verify_info

Since we've started fetching sid/pgid from the
dumpee context we're allowed to obtain sid/pgid
on a slave peer. This is perfectly valid. So
drop this test.

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