Merge pull request #57954 from tianshapjq/cleanup-useless-func-network/plugins.go

Automatic merge from submit-queue (batch tested with PRs 57954, 62166). 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>.

clean up useless func in pkg/kubelet/network/plugins.go

**What this PR does / why we need it**:
clean up useless func in pkg/kubelet/network/plugins.go

**Release note**:

```release-note

```NONE
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Kubernetes Submit Queue 2018-05-09 07:17:09 -07:00 committed by GitHub
commit 1416d63f79
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