Automatic merge from submit-queue

Don't do string(int)

This is causing https://github.com/kubernetes/kubernetes/pull/29147 to fail the unit test, because the bug prints control character to the test log, and the grep at this [line](https://github.com/kubernetes/kubernetes/blob/master/hack/make-rules/test.sh#L190) returns `Binary file (standard input) matches` error. I don't know why this bug isn't caught before.