stage0: Switch to use updated ioprogress
stage0: Switch to use updated ioprogress

ioprogress was updated, this change makes rkt use a function that was
added to prevent drawing the download bar when not drawing to a
terminal.

cab105/rkt,jasonchaffee/rkt,lee212/rkt,jzelinskie/rkt,dgonyeo/rkt,iaguis/rkt,cab105/rkt,matthaias/rkt,ybubnov/rkt,euank/rkt,adfernandes/rkt,akshaykarle/rkt,squeed/rkt,jzelinskie/rkt,akshaykarle/rkt,krnowak/rkt,sinfomicien/rkt,coreos/rkt,squeed/rkt,lucasallan/rkt,squeed/rkt,sgotti/rkt,endocode/rkt,rkt/rkt,jonboulle/rkt,joshix/rkt,lee212/rkt,il9ue/rkt,blixtra/rkt,sstabellini/rkt,blixtra/rkt,ybubnov/rkt,intelsdi-x/rkt,yifan-gu/rocket,jonboulle/rkt,nhlfr/rkt,liubq919/rkt,cab105/rkt,lee212/rkt,jakon89/rkt,dgonyeo/rkt,intelsdi-x/rkt,jonboulle/rkt,alban/rkt,monstermunchkin/rkt,markllama/rkt,iaguis/rkt,matthaias/rkt,kbrwn/rkt,s-urbaniak/rkt,iaguis/rkt,jasonchaffee/rkt,yifan-gu/rocket,jjlakis/rkt,krnowak/rkt,adfernandes/rkt,rkt/rkt,kinvolk/rkt,liubq919/rkt,euank/rkt,jjlakis/rkt,joshix/rkt,kinvolk/rkt,markllama/rkt,Wilybald/rkt,adfernandes/rkt,sstabellini/rkt,Shashwatsh/rkt,nhlfr/rkt,sgotti/rkt,s-urbaniak/rkt,sstabellini/rkt,jzelinskie/rkt,tmrts/rkt,monstermunchkin/rkt,linki/rkt,kbrwn/rkt,sinfomicien/rkt,linki/rkt,Wilybald/rkt,coreos/rkt,nhlfr/rkt,kinvolk/rkt,jasonchaffee/rkt,Wilybald/rkt,achanda/rkt,kbrwn/rkt,sinfomicien/rkt,mike1729/rkt,rkt/rkt,shobhit85/rkt,mike1729/rkt,yifan-gu/rkt,s-urbaniak/rkt,jakon89/rkt,joshix/rkt,achanda/rkt,il9ue/rkt,yifan-gu/rkt,alban/rkt,sgotti/rkt,monstermunchkin/rkt,matthaias/rkt,intelsdi-x/rkt,akshaykarle/rkt,lucasallan/rkt,joshix/rkt,ybubnov/rkt,yifan-gu/rocket,jjlakis/rkt,liugenping/rkt,Shashwatsh/rkt,tmrts/rkt,liubq919/rkt,lucasallan/rkt,euank/rkt,shobhit85/rkt,endocode/rkt,il9ue/rkt,mike1729/rkt,tmrts/rkt,markllama/rkt,alban/rkt,Wilybald/rkt,liugenping/rkt,liugenping/rkt,dgonyeo/rkt,yifan-gu/rkt,rkt/rkt,blixtra/rkt,lucasallan/rkt,kinvolk/rkt,shobhit85/rkt,krnowak/rkt,Shashwatsh/rkt,endocode/rkt,linki/rkt,jakon89/rkt,achanda/rkt,coreos/rkt