pkg/uid: add function to unshift uid/gid
pkg/uid: add function to unshift uid/gid

Wilybald/rkt,ybubnov/rkt,Wilybald/rkt,monstermunchkin/rkt,akshaykarle/rkt,sstabellini/rkt,achanda/rkt,euank/rkt,jakon89/rkt,tmrts/rkt,il9ue/rkt,lucasallan/rkt,tmrts/rkt,markllama/rkt,Wilybald/rkt,intelsdi-x/rkt,yifan-gu/rocket,rkt/rkt,lucasallan/rkt,yifan-gu/rocket,s-urbaniak/rkt,jakon89/rkt,achanda/rkt,matthaias/rkt,shobhit85/rkt,akshaykarle/rkt,kinvolk/rkt,alban/rkt,cab105/rkt,jjlakis/rkt,mike1729/rkt,kinvolk/rkt,il9ue/rkt,markllama/rkt,yifan-gu/rocket,sgotti/rkt,euank/rkt,jjlakis/rkt,alban/rkt,joshix/rkt,dgonyeo/rkt,dgonyeo/rkt,markllama/rkt,ybubnov/rkt,alban/rkt,monstermunchkin/rkt,matthaias/rkt,sgotti/rkt,kinvolk/rkt,intelsdi-x/rkt,rkt/rkt,joshix/rkt,achanda/rkt,ybubnov/rkt,jonboulle/rkt,Wilybald/rkt,Shashwatsh/rkt,lucasallan/rkt,squeed/rkt,shobhit85/rkt,yifan-gu/rkt,jakon89/rkt,s-urbaniak/rkt,squeed/rkt,matthaias/rkt,Shashwatsh/rkt,coreos/rkt,euank/rkt,coreos/rkt,intelsdi-x/rkt,akshaykarle/rkt,rkt/rkt,dgonyeo/rkt,monstermunchkin/rkt,mike1729/rkt,nhlfr/rkt,lucasallan/rkt,cab105/rkt,mike1729/rkt,jonboulle/rkt,cab105/rkt,rkt/rkt,shobhit85/rkt,Shashwatsh/rkt,jjlakis/rkt,coreos/rkt,nhlfr/rkt,tmrts/rkt,il9ue/rkt,joshix/rkt,nhlfr/rkt,sstabellini/rkt,s-urbaniak/rkt,joshix/rkt,squeed/rkt,yifan-gu/rkt,jonboulle/rkt,kinvolk/rkt,yifan-gu/rkt,sgotti/rkt,sstabellini/rkt