Refactor Get/List VirtualMachine methods to reflect VMI return types

[kellydx]

Refactor Get/List VirtualMachine methods to reflect VMI return types

What this PR does / why we need it:
The original function names were misleading because the functions return VirtualMachineInstance types.
The changes in mocked_client.go is auto generated.

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

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Release note:

[kubevirt-bot]

Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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[kubevirt-bot]

PR needs rebase.

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[kubevirt-bot]

There has been no activity on this PR for 45 days.
To protect limited CI resources, it has been automatically labelled 'stale'.
This PR will automatically rot after an additional 14 days of inactivity, and will be closed shortly after that.

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/lifecycle stale

[awels]

/remove-lifecycle stale
Have not gotten around to reviewing this, but it definitely needs a rebase.