Automatic merge from submit-queue

Use kubekins-test:v20160822 everywhere

A step towards fixing #31148. We also need to update the test-infra repo to use the new e2e image. I'll fold that into https://github.com/kubernetes/test-infra/pull/419.

Both gcr.io/google-containers/kubekins-test:v20160822 and gcr.io/google-containers/e2e-test:v20160822 have already been pushed.