UT update for powervs machine

[GunaKKIBM]

What this PR does / why we need it: Code coverage increase

Special notes for your reviewer:

/area provider/ibmcloud

1. Please confirm that if this PR changes any image versions, then that's the sole change this PR makes. No change in any image version or functionality

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[Karthik-K-N]

/ok-to-test

[Prajyot-Parab]

@GunaKKIBM Please squash the commits.

[GunaKKIBM]

@Karthik-K-N @Amulyam24 @Prajyot-Parab I have addressed the comments, and updated test case names, PTAL.

[Amulyam24]

@GunaKKIBM, it would be great if you could please squash the commits.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: GunaKKIBM, Prajyot-Parab

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