Update Unit tests section in Portworx CSI migration KEP

[trierra]

This commit updates the Unit test section in KEP

• One-line PR description: Update KEP for Portworx CSI Migration

• Issue link: Portworx file in-tree to CSI driver migration #Portworx file in-tree to CSI driver migration  #2589

• Other comments:
  /sig storage

[k8s-ci-robot]

Hi @trierra. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[xing-yang]

/ok-to-test

[xing-yang]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: trierra, xing-yang

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