rkt: make image list order flag case-insensitive
rkt: make image list order flag case-insensitive

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