Automatic merge from submit-queue

Allow starting test etcd with http

There are cases where we'll want to start a test etcd without https (external tools monitoring tests, tests with lots of parallelism, etc). This makes it an option.

Helps with https://github.com/kubernetes/kubernetes/issues/23127

<!-- Reviewable:start -->
---
This change is [<img src="http://reviewable.k8s.io/review_button.svg" height="35" align="absmiddle" alt="Reviewable"/>](http://reviewable.k8s.io/reviews/kubernetes/kubernetes/22919)
<!-- Reviewable:end -->