Refactor rolling update tests

[johngmyers]

In preparation for the next feature.

/area rolling-update

[k8s-ci-robot]

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[rifelpet]

/ok-to-test

[justinsb]

Thanks @johngmyers - much easier setup! Not sure what happened with the tests (shows a failure and a pass), I'm guessing that two tests crossed, so I'm going to approve and we can fix if needed.

/approve
/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: johngmyers, justinsb

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