tty: proto -- Add comments on some fields
tty: proto -- Add comments on some fields

Actually these @locked and @packet_mode are
valid for unix98 ptys only so since moving
them into @tty_pty_entry is impossible at
least lets comment this.

Signed-off-by: Cyrill Gorcunov <7a1ea01eee6961eb1e372e3508c2670446d086f4@openvz.org>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

sdgdsffdsfff/criu,LK4D4/criu,gablg1/criu,rentzsch/criu,gonkulator/criu,marcosnils/criu,tych0/criu,rentzsch/criu,ldu4/criu,eabatalov/criu,gablg1/criu,KKoukiou/criu-remote,wtf42/criu,wtf42/criu,marcosnils/criu,tych0/criu,rentzsch/criu,gonkulator/criu,wtf42/criu,efiop/criu,marcosnils/criu,tych0/criu,biddyweb/criu,sdgdsffdsfff/criu,efiop/criu,LK4D4/criu,fbocharov/criu,fbocharov/criu,svloyso/criu,sdgdsffdsfff/criu,sdgdsffdsfff/criu,ldu4/criu,AuthenticEshkinKot/criu,efiop/criu,KKoukiou/criu-remote,biddyweb/criu,rentzsch/criu,rentzsch/criu,biddyweb/criu,KKoukiou/criu-remote,gonkulator/criu,marcosnils/criu,efiop/criu,biddyweb/criu,wtf42/criu,KKoukiou/criu-remote,fbocharov/criu,efiop/criu,tych0/criu,biddyweb/criu,svloyso/criu,eabatalov/criu,eabatalov/criu,gablg1/criu,wtf42/criu,KKoukiou/criu-remote,fbocharov/criu,AuthenticEshkinKot/criu,AuthenticEshkinKot/criu,AuthenticEshkinKot/criu,gablg1/criu,wtf42/criu,fbocharov/criu,svloyso/criu,tych0/criu,AuthenticEshkinKot/criu,AuthenticEshkinKot/criu,tych0/criu,efiop/criu,KKoukiou/criu-remote,eabatalov/criu,svloyso/criu,LK4D4/criu,sdgdsffdsfff/criu,svloyso/criu,gonkulator/criu,ldu4/criu,gablg1/criu,eabatalov/criu,sdgdsffdsfff/criu,eabatalov/criu,LK4D4/criu,ldu4/criu,marcosnils/criu,ldu4/criu,marcosnils/criu,ldu4/criu,rentzsch/criu,gonkulator/criu,svloyso/criu,LK4D4/criu,LK4D4/criu,gonkulator/criu,fbocharov/criu,gablg1/criu,biddyweb/criu