Added output to tar command so it does not cause timeout to kick in.
Added output to tar command so it does not cause timeout to kick in.

Review URL: http://codereview.chromium.org/3076012

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