OCTOPUS-612: Updates variables.tf to use correct nfs-client-provisioner Image

[Chandan-Abhyankar]

OCTOPUS-612: Changes are made so that by default nfs-client-provisioner image is "registry.k8s.io/sig-storage/nfs-subdir-external-provisioner:v4.0.2"

[ppc64le-cloud-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: Chandan-Abhyankar Once this PR has been reviewed and has the lgtm label, please assign cs-zhang for approval. For more information see the Kubernetes Code Review Process.

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[ppc64le-cloud-bot]

@Chandan-Abhyankar: PR is not mergeable.

The PR state is: BLOCKED 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.

[yussufsh]

/meow @Rajalakshmi-Girish

[Rajalakshmi-Girish]

/meow

[ppc64le-cloud-bot]

@Rajalakshmi-Girish:

In response to [this](https://github.com/ocp-power-automation/ocp4-upi-powervm/pull/280#issuecomment-1947776210): >/meow 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.

[Rajalakshmi-Girish]

/meow @Rajalakshmi-Girish

There was an issue yesterday with triggers reaching hook. It is fixed now.