source/kernel: Add module whitelist

[ozhuraki]

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[k8s-ci-robot]

Hi @ozhuraki. 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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[marquiz]

Hi @ozhuraki what's the context/motivation for this? I'd much rather see a generic mechanism (á la #2255) for enabling/disabling features than rather unwieldy per-feature regexps.