zdtm: Sanitize cgroup00 test
zdtm: Sanitize cgroup00 test

Prepare it for multiple tasks by moving cg creation and
checking code into helpers.

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

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