Fix(nfs-client): Remove deployment.yaml duplicate selector fields

[daviyang35]

Remove duplicate selector fields

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[daviyang35]

/assign @wongma7

[wongma7]

whoops. /lgtm /approve but need CLA

[wongma7]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: wongma7

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[daviyang35]

I signed it

[daviyang35]

/retest

[k8s-ci-robot]

@daviyang35: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to [this](https://github.com/kubernetes-incubator/external-storage/pull/1283#issuecomment-588695973): >/retest Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[daviyang35]

/ok-to-test

[k8s-ci-robot]

@daviyang35: Cannot trigger testing until a trusted user reviews the PR and leaves an /ok-to-test message.

In response to [this](https://github.com/kubernetes-incubator/external-storage/pull/1283#issuecomment-588696809): >/ok-to-test Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[daviyang35]

@wongma7 The travis ci build faild with cmake command error. Pls process it.