Switch to e2 machine type

[TerryHowe]

What this PR does / why we need it:
N1 one machines are outdated and going to be more expensive

Reference kubernetes/k8s.io#5059

[k8s-ci-robot]

Hi @TerryHowe. Thanks for your PR.

I'm waiting for a kubernetes-sigs 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.

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[mboersma]

/ok-to-test

[kkeshavamurthy]

/lgtm
/approve

[TerryHowe]

/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kkeshavamurthy, TerryHowe

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