enforce feature constraints

[deads2k]

1. on create, only allow a whitelist of options
2. on update, allow untouched fields to remain, but if they are touched, they are subject to normal validation
3. on update, do not allow changing from techpreview to not techpreview
4. ban all features.config.openshift.io deletion to prevent deletion and recreation without techpreview

/assign @derekwaynecarr

[deads2k]

/retest

[derekwaynecarr]

the code looks good, but we should probably have a few unit tests.

[deads2k]

the code looks good, but we should probably have a few unit tests.

sure

[openshift-bot]

/retest

Please review the full test history for this PR and help us cut down flakes.

[deads2k]

/retest

[deads2k]

/retest

[deads2k]

/lgtm

[openshift-ci-robot]

@deads2k: you cannot LGTM your own PR.

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/lgtm

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[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: deads2k

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[openshift-bot]

/retest

Please review the full test history for this PR and help us cut down flakes.