fix(build_image): Add group prefix to image output directories.
fix(build_image): Add group prefix to image output directories.

fivethreeo/scripts,trnubo/scripts,vmware/coreos-scripts,BugRoger/scripts,vmware/coreos-scripts,marineam/coreos-scripts,coreos/scripts,endocode/scripts,endocode/scripts,BugRoger/scripts,gtank/scripts,BugRoger/scripts,glevand/coreos--scripts,mjg59/scripts,endocode/scripts,zhang0137/scripts,marineam/coreos-scripts,zhang0137/scripts,mjg59/scripts,nicescale/scripts,andrejro/coreos--scripts,zhang0137/scripts,glevand/coreos--scripts,mjg59/scripts,sigma/coreos-scripts,sigma/coreos-scripts,coreos/scripts,fivethreeo/scripts,trnubo/scripts,gtank/scripts,nicescale/scripts,trnubo/scripts,smilart/scripts,smilart/scripts,smilart/scripts,fivethreeo/scripts,vmware/coreos-scripts,andrejro/coreos--scripts,mischief/scripts,andrejro/coreos--scripts,gtank/scripts,mischief/scripts,nicescale/scripts,sigma/coreos-scripts,mischief/scripts,marineam/coreos-scripts