fix(build_packages): Don't redirect emerge output.
fix(build_packages): Don't redirect emerge output.

The stats upload has been removed so there is no longer a need to
capture the emerge output to parse the logged output. Remove a bit of
dead chromeos logic too.

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