Automatic merge from submit-queue

Use `make release` on Jenkins to support crossbuilds

Partner PR to https://github.com/kubernetes/test-infra/pull/440 to fix https://github.com/kubernetes/test-infra/issues/393.

We probably should pull the build functionality out of e2e.go entirely, but I leave that to future work.

cc @luxas @david-mcmahon @fejta