Automated cherry pick of #1875: Require VACs to use SI units

[travisyx]

Cherry pick of #1875 on release-1.15.

#1875: Require VACs to use SI units

For details on the cherry pick process, see the cherry pick requests page.

This feature changes VolumeAttributesClass, so throughput specifications will need "Mi".

[k8s-ci-robot]

Hi @travisyx. Thanks for your PR.

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[amacaskill]

/ok-to-test

[amacaskill]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: amacaskill, travisyx

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