Automatic merge from submit-queue. 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>.
Fix golint warnings in daemon controller
This fixes the golint errors in the daemon controller package.
The only on remaining asks to rename DaemonSetsController, which is a public interface and would need proper deprecation first.
**Special notes for your reviewer**:
**Release note**:
I don't believe a release note is required. It only fixes code comments.
```release-note
NONE
```
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