stage1: fix getOwnCgroupPath function
stage1: fix getOwnCgroupPath function

It wasn't taking into account combined controllers.

Yhgenomics/rkt,fdserr/rkt,rot26/rkt,tixxdz/rkt,linki/rkt,linki/rkt,Shashwatsh/rkt,yifan-gu/rkt,smarvin/rkt,iankronquist/rkt,lucasallan/rkt,yifan-gu/rkt,achanda/rkt,tmrts/rkt,mike1729/rkt,shobhit85/rkt,lee212/rkt,lucasallan/rkt,sinfomicien/rkt,mjg59/rkt,crawford/rkt,liubq919/rkt,fdserr/rkt,Wilybald/rkt,chrisseto/rkt,rot26/rkt,jasonchaffee/rkt,yifan-gu/rocket,michelangelo13/rkt,tv42/rkt,iaguis/rkt,jzelinskie/rkt,smarvin/rkt,Shashwatsh/rkt,liugenping/rkt,kinvolk/rkt,Yhgenomics/rkt,krnowak/rkt,endocode/rkt,MattDees/rkt,kbrwn/rkt,MattDees/rkt,jzelinskie/rkt,dalanlan/rkt,intfrr/rkt,Wilybald/rkt,kinvolk/rkt,yifan-gu/rocket,dalanlan/rkt,bsmr-go/rkt,coreos/rkt,endocode/rkt,wparad/rkt,lee212/rkt,tv42/rkt,Shashwatsh/rkt,ChengTiesheng/rkt,monstermunchkin/rkt,coreos/rkt,il9ue/rkt,joshix/rkt,akshaykarle/rkt,tv42/rkt,nhlfr/rkt,blixtra/rkt,MattDees/rkt,sgotti/rkt,liugenping/rkt,euank/rkt,rot26/rkt,bsmr-go/rkt,shobhit85/rkt,liubq919/rkt,yifan-gu/rocket,monstermunchkin/rkt,intelsdi-x/rkt,joshix/rkt,crawford/rkt,alban/rkt,dalanlan/rkt,squaremo/rkt,jjlakis/rkt,s-urbaniak/rkt,luebken/rkt,dgonyeo/rkt,maquanyi/rkt,jjlakis/rkt,dgonyeo/rkt,euank/rkt,jakon89/rkt,ybubnov/rkt,iankronquist/rkt,markllama/rkt,alexhersh/rkt,tmrts/rkt,mjg59/rkt,sgotti/rkt,blixtra/rkt,sgotti/rkt,monstermunchkin/rkt,Yhgenomics/rkt,alban/rkt,maquanyi/rkt,akshaykarle/rkt,jonboulle/rkt,mike1729/rkt,cab105/rkt,jasonchaffee/rkt,lucasallan/rkt,ChengTiesheng/rkt,lucasallan/rkt,chrisseto/rkt,kinvolk/rkt,endocode/rkt,cab105/rkt,intfrr/rkt,iankronquist/rkt,jzelinskie/rkt,ybubnov/rkt,kbrwn/rkt,jjlakis/rkt,marineam/rkt,coreos/rkt,rkt/rkt,Wilybald/rkt,iaguis/rkt,rhvgoyal/rkt,s-urbaniak/rkt,liubq919/rkt,linki/rkt,il9ue/rkt,alban/rkt,rkt/rkt,krnowak/rkt,kbrwn/rkt,squaremo/rkt,nhlfr/rkt,il9ue/rkt,liugenping/rkt,rhvgoyal/rkt,matthaias/rkt,iaguis/rkt,cab105/rkt,s-urbaniak/rkt,luebken/rkt,mjg59/rkt,ChengTiesheng/rkt,rkt/rkt,dgonyeo/rkt,adfernandes/rkt,intfrr/rkt,sinfomicien/rkt,krnowak/rkt,jonboulle/rkt,squeed/rkt,sstabellini/rkt,akshaykarle/rkt,intelsdi-x/rkt,smarvin/rkt,maquanyi/rkt,jakon89/rkt,marineam/rkt,wparad/rkt,yifan-gu/rkt,adfernandes/rkt,rhvgoyal/rkt,matthaias/rkt,jakon89/rkt,sstabellini/rkt,jonboulle/rkt,intelsdi-x/rkt,markllama/rkt,mike1729/rkt,fdserr/rkt,chrisseto/rkt,tmrts/rkt,sstabellini/rkt,michelangelo13/rkt,crawford/rkt,lee212/rkt,squaremo/rkt,joshix/rkt,shobhit85/rkt,squeed/rkt,kinvolk/rkt,matthaias/rkt,tixxdz/rkt,euank/rkt,marineam/rkt,joshix/rkt,markllama/rkt,adfernandes/rkt,alexhersh/rkt,Wilybald/rkt,achanda/rkt,tixxdz/rkt,wparad/rkt,achanda/rkt,squeed/rkt,luebken/rkt,nhlfr/rkt,michelangelo13/rkt,bsmr-go/rkt,alexhersh/rkt,jasonchaffee/rkt,blixtra/rkt,ybubnov/rkt,rkt/rkt,sinfomicien/rkt