Cleanup and add open to push test image to usb
Cleanup and add open to push test image to usb

Review URL: http://codereview.chromium.org/668170

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