Use the dl.k8s.io CDN w/o slash for artifacts in kubetest2-ec2 jobs#36636

k8s-ci-robot merged 2 commits intokubernetes:masterkubernetes/test-infra:masterfrom

nrb:kubetest2-ec2-cdn-fixnrb/test-infra:kubetest2-ec2-cdn-fixCopy head branch name to clipboard