cros_workon: when finding the ebuild path, look for the 9999 ebuild
cros_workon: when finding the ebuild path, look for the 9999 ebuild

	modified:   cros_workon

Review URL: http://codereview.chromium.org/3015063

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