fix a sudo issue
fix a sudo issue

Review URL: http://codereview.chromium.org/1549025

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