stage1: explicitly set permissions on shared volumes
stage1: explicitly set permissions on shared volumes

This removes the setgid bit on the shared volumes directory.

kinvolk/rkt,tmrts/rkt,joshix/rkt,lucasallan/rkt,squeed/rkt,lucasallan/rkt,blixtra/rkt,coreos/rkt,nhlfr/rkt,Wilybald/rkt,s-urbaniak/rkt,nhlfr/rkt,achanda/rkt,yifan-gu/rocket,jonboulle/rkt,linki/rkt,kinvolk/rkt,ybubnov/rkt,shobhit85/rkt,ybubnov/rkt,il9ue/rkt,markllama/rkt,jjlakis/rkt,jakon89/rkt,alban/rkt,joshix/rkt,jonboulle/rkt,alban/rkt,nhlfr/rkt,rkt/rkt,matthaias/rkt,linki/rkt,monstermunchkin/rkt,markllama/rkt,liugenping/rkt,Shashwatsh/rkt,lucasallan/rkt,adfernandes/rkt,Wilybald/rkt,linki/rkt,blixtra/rkt,kinvolk/rkt,il9ue/rkt,Wilybald/rkt,squeed/rkt,sinfomicien/rkt,kbrwn/rkt,adfernandes/rkt,alban/rkt,euank/rkt,cab105/rkt,joshix/rkt,sstabellini/rkt,yifan-gu/rkt,jzelinskie/rkt,ybubnov/rkt,dgonyeo/rkt,akshaykarle/rkt,jakon89/rkt,il9ue/rkt,s-urbaniak/rkt,intelsdi-x/rkt,rkt/rkt,mike1729/rkt,kinvolk/rkt,s-urbaniak/rkt,achanda/rkt,squeed/rkt,cab105/rkt,monstermunchkin/rkt,euank/rkt,akshaykarle/rkt,endocode/rkt,jasonchaffee/rkt,intelsdi-x/rkt,cab105/rkt,krnowak/rkt,lucasallan/rkt,yifan-gu/rocket,endocode/rkt,endocode/rkt,jzelinskie/rkt,tmrts/rkt,sgotti/rkt,shobhit85/rkt,liugenping/rkt,intelsdi-x/rkt,yifan-gu/rocket,krnowak/rkt,adfernandes/rkt,sgotti/rkt,dgonyeo/rkt,krnowak/rkt,joshix/rkt,jakon89/rkt,yifan-gu/rkt,markllama/rkt,mike1729/rkt,sstabellini/rkt,jzelinskie/rkt,akshaykarle/rkt,blixtra/rkt,monstermunchkin/rkt,matthaias/rkt,achanda/rkt,dgonyeo/rkt,shobhit85/rkt,rkt/rkt,coreos/rkt,jasonchaffee/rkt,tmrts/rkt,Shashwatsh/rkt,jasonchaffee/rkt,sgotti/rkt,matthaias/rkt,Shashwatsh/rkt,jonboulle/rkt,Wilybald/rkt,euank/rkt,jjlakis/rkt,liugenping/rkt,kbrwn/rkt,mike1729/rkt,sinfomicien/rkt,yifan-gu/rkt,sstabellini/rkt,coreos/rkt,jjlakis/rkt,sinfomicien/rkt,kbrwn/rkt,rkt/rkt