cg: Add comment why cgroup ns flag is not passed to clone
cg: Add comment why cgroup ns flag is not passed to clone

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

KKoukiou/criu-remote,eabatalov/criu,efiop/criu,AuthenticEshkinKot/criu,AuthenticEshkinKot/criu,ldu4/criu,AuthenticEshkinKot/criu,efiop/criu,efiop/criu,ldu4/criu,AuthenticEshkinKot/criu,ldu4/criu,eabatalov/criu,AuthenticEshkinKot/criu,KKoukiou/criu-remote,ldu4/criu,eabatalov/criu,KKoukiou/criu-remote,KKoukiou/criu-remote,ldu4/criu,AuthenticEshkinKot/criu,efiop/criu,eabatalov/criu,efiop/criu,eabatalov/criu,efiop/criu,KKoukiou/criu-remote,ldu4/criu,eabatalov/criu,KKoukiou/criu-remote