[WIP] API for no-overlay mode in OVN-Kubernetes

[ricky-rav]

Using this as draft for the related openshift enhancement: openshift/enhancements#1859

[openshift-ci]

Hello @ricky-rav! Some important instructions when contributing to openshift/api:
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[openshift-ci]

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[openshift-ci]

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[JoelSpeed]

@ricky-rav Is this ready for an initial round of API review?

[ricky-rav]

@ricky-rav Is this ready for an initial round of API review?

No no, it was just a draft for myself to keep track of the API changes in an enhancement I'm writing. I think @pliurh is taking over the API part of the feature.