tcp: Get TCP_INFO once per socket
tcp: Get TCP_INFO once per socket

Right now we get SOL_TCP.TCP_INFO option twice, but one time
is enough.

Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@virtuozzo.com>

KKoukiou/criu-remote,AuthenticEshkinKot/criu,eabatalov/criu,efiop/criu,eabatalov/criu,efiop/criu,KKoukiou/criu-remote,efiop/criu,AuthenticEshkinKot/criu,KKoukiou/criu-remote,AuthenticEshkinKot/criu,KKoukiou/criu-remote,efiop/criu,KKoukiou/criu-remote,KKoukiou/criu-remote,eabatalov/criu,AuthenticEshkinKot/criu,eabatalov/criu,AuthenticEshkinKot/criu,efiop/criu,AuthenticEshkinKot/criu,efiop/criu,eabatalov/criu,eabatalov/criu