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Automatic merge from submit-queue [Pet Set] Refactor return []error to error <!-- Thanks for sending a pull request! Here are some tips for you: 1. If this is your first time, read our contributor guidelines https://github.com/kubernetes/kubernetes/blob/master/CONTRIBUTING.md and developer guide https://github.com/kubernetes/kubernetes/blob/master/docs/devel/development.md 2. If you want *faster* PR reviews, read how: https://github.com/kubernetes/kubernetes/blob/master/docs/devel/faster_reviews.md 3. Follow the instructions for writing a release note: https://github.com/kubernetes/kubernetes/blob/master/docs/devel/pull-requests.md#release-notes --> **Which issue this PR fixes** I propose refactor return value from `[]error` to error [here](https://github.com/kubernetes/kubernetes/blob/master/pkg/controller/petset/pet_set.go#L80), for the purpose of simplify code and format error output. I think we can use `errors.NewAggregate(errorList)` to aggregate `[]error`.