Automatic merge from submit-queue (batch tested with PRs 66076, 65792, 65649). If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

kubernetes: fix printf format errors

These are all flagged by Go 1.11's
more accurate printf checking in go vet,
which runs as part of go test.

```release-note
NONE
```