Move to golang 1.12.1 official image
Move to golang 1.12.1 official image

We used 1.12.0 + hack to download 1.12.1 binaries as we were in a rush
on friday since the images were not published at that time. Let's remove
the hack now and republish the kubekins-test image

Change-Id: I41ab3976a5cf2afe1bfc6921b729b3043b6129f7

cjwagner/test-infra,BenTheElder/test-infra,monopole/test-infra,krzyzacy/test-infra,jessfraz/test-infra,michelle192837/test-infra,monopole/test-infra,monopole/test-infra,krzyzacy/test-infra,krzyzacy/test-infra,jessfraz/test-infra,pwittrock/test-infra,jessfraz/test-infra,ixdy/kubernetes-test-infra,fejta/test-infra,krzyzacy/test-infra,cblecker/test-infra,lavalamp/test-infra,fejta/test-infra,cblecker/test-infra,michelle192837/test-infra,brahmaroutu/test-infra,cjwagner/test-infra,dims/test-infra,brahmaroutu/test-infra,fejta/test-infra,dims/test-infra,lavalamp/test-infra,BenTheElder/test-infra,kubernetes/test-infra,lavalamp/test-infra,cjwagner/test-infra,kubernetes/test-infra,brahmaroutu/test-infra,kubernetes/test-infra,brahmaroutu/test-infra,krzyzacy/test-infra,cblecker/test-infra,dims/test-infra,cjwagner/test-infra,fejta/test-infra,BenTheElder/test-infra,ixdy/kubernetes-test-infra,kubernetes/test-infra,ixdy/kubernetes-test-infra,pwittrock/test-infra,brahmaroutu/test-infra,monopole/test-infra,ixdy/kubernetes-test-infra,monopole/test-infra,cblecker/test-infra,kubernetes/test-infra,pwittrock/test-infra,jessfraz/test-infra,cjwagner/test-infra,jessfraz/test-infra,brahmaroutu/test-infra,michelle192837/test-infra,ixdy/kubernetes-test-infra,krzyzacy/test-infra,cblecker/test-infra,dims/test-infra,lavalamp/test-infra,fejta/test-infra,dims/test-infra,michelle192837/test-infra,BenTheElder/test-infra,pwittrock/test-infra,jessfraz/test-infra,monopole/test-infra,cjwagner/test-infra,kubernetes/test-infra,lavalamp/test-infra,michelle192837/test-infra,lavalamp/test-infra,michelle192837/test-infra,dims/test-infra,fejta/test-infra,BenTheElder/test-infra,pwittrock/test-infra,cblecker/test-infra,BenTheElder/test-infra