Automatic merge from submit-queue

[Garbage Collector] add e2e tests again

#27151 is reverted because gke didn't start correctly after it's merged (https://github.com/kubernetes/kubernetes/pull/27151#issuecomment-233030686).

The possible problem is the `unbound variable`, which is fixed in the second commit of this PR. However, I cannot verify if the PR will fail the gke suite since I don't have the environment to run that suite.

@wojtek-t @lavalamp