Remove KOPS_URL fallback
Remove KOPS_URL fallback

Not needed after kubernetes/test-infra#1482

justinsb/kops,justinsb/kops,andrewsykim/kops,zytek/kops,gambol99/kops,BradErz/kops,aledbf/kops,DualSpark/kops,dacohen/kops,chrislovecnm/kops,andrewsykim/kops,BradErz/kops,tsupertramp/kops,sp-borja-juncosa/kops,zytek/kops,ikropotov/kops,mad01/kops,DualSpark/kops,reactiveops/kops,blakebarnett/kops,MadDogTechnology/kops,BradErz/kops,andrewsykim/kops,pdh/kops,chrislovecnm/kops,leandrocr/kops,chrislovecnm/kops,mad01/kops,kris-nova/kops,kubernetes/kops,chrislovecnm/kops,tsupertramp/kops,leandrocr/kops,justinsb/kops,austinmoore-/kops,kubernetes/kops,BradErz/kops,robinpercy/kops,ikropotov/kops,MadDogTechnology/kops,blakebarnett/kops,DualSpark/kops,austinmoore-/kops,luomiao/kops,reactiveops/kops,andrewsykim/kops,aledbf/kops,robinpercy/kops,dacohen/kops,sethpollack/kops,faraazkhan/kops,aledbf/kops,kris-nova/kops,mad01/kops,zytek/kops,kris-nova/kops,luomiao/kops,reactiveops/kops,aledbf/kops,luomiao/kops,austinmoore-/kops,DualSpark/kops,pdh/kops,gambol99/kops,MadDogTechnology/kops,WillemMali/kops,mad01/kops,sp-borja-juncosa/kops,kubernetes/kops,dacohen/kops,WillemMali/kops,tsupertramp/kops,zytek/kops,MadDogTechnology/kops,sethpollack/kops,blakebarnett/kops,robinpercy/kops,gambol99/kops,pdh/kops,dacohen/kops,reactiveops/kops,WillemMali/kops,blakebarnett/kops,sp-borja-juncosa/kops,leandrocr/kops,sethpollack/kops,tsupertramp/kops,faraazkhan/kops,sp-borja-juncosa/kops,WillemMali/kops,robinpercy/kops,faraazkhan/kops,faraazkhan/kops,pdh/kops,luomiao/kops,leandrocr/kops,ikropotov/kops,ikropotov/kops,austinmoore-/kops,sethpollack/kops,kris-nova/kops,gambol99/kops