images: switch to NoCompression for docker2aci
images: switch to NoCompression for docker2aci

Since this is just a temporary ACI which immediately gets imported
straight into the CAS (uncompressed), there's no real advantage to
compressing here (other than saving a little temporary disk space), and
a performance gain to not compressing.

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