Refactor apiserver templates

[georgebuckerfield]

Fixes #3247 by moving the apiserver configuration out of template files and into code.

[k8s-ci-robot]

Hi @georgebuckerfield. Thanks for your PR.

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[justinsb]

/ok-to-test

/lgtm

Thank you @georgebuckerfield - greatly appreciated :-)

[k8s-github-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[k8s-github-robot]

/test all [submit-queue is verifying that this PR is safe to merge]

[k8s-github-robot]

Automatic merge from submit-queue