Allow HNC to propagate changes to CRD.

[just1900]

A PR would be great, thanks! Just a few quick pointers / requests:

• A change like this benefits from a lot of comments, e.g. linking to this issue. Otherwise we'll have no idea why we added this in a few months.
• It would be great if you could add or update a unit test to verify that the rV is being copied (e.g. here.

• It would be amazing if you could update an end-to-end test (e.g. here) to try to propagate a CRD, show that this fails without your fix, and that it passes with your fix. This test is probably a pretty good model, and you can embed yaml in the test as shown here.

  • The e2e tests assume that you've deployed HNC to a cluster, and your kubectl config is currently pointing at the cluster you want to run the tests on.
  • Running all the e2e tests takes ~30min but you only need to run the one you're writing. So you can modify your test so that the It() function has an F (for "focus") in front of it, like this: FIt() (note the first two letters are capitalized). This will only run your test. Just remember to change it back to It() before you submit the PR.
• We use one commit per PR so please squash all commits and force-update the PR branch if necessary. We also describe how we tested the change in the commit message like this.

@adrianludwin PTAL, follow your pointers

• I have link the issue and add some description to the code
• for the unit test, I have no idea about how to verify that the rV is being copied by now, because every resource in k8s will have a ResourceVersion.
• e2e test have been added and tested.
• the commit msg is detailed for how to reproduce before this pr's change.

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[APPROVALNOTIFIER] This PR is NOT APPROVED

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[just1900]

I signed it

[adrianludwin]

Oh man, I just realized this is in the wrong repo! Sorry I didn't pick up on that. Can you please make this change in https://github.com/kubernetes-sigs/hierarchical-namespaces instead? Sorry about that. The code hasn't changed very much (apart from the paths - the incubator/hnc prefix has been removed) so it should be fairly easy to recreate the change in the new repo. I'm really sorry I missed that.

[just1900]

I didn't realize that either 😂, I've open another PR there https://github.com/kubernetes-sigs/hierarchical-namespaces/pull/59. Shall we close this one?

[adrianludwin]

Yup! Closing this copy.

/close

[k8s-ci-robot]

@adrianludwin: Closed this PR.

In response to [this](https://github.com/kubernetes-sigs/multi-tenancy/pull/1513#issuecomment-877240877): >Yup! Closing this copy. > >/close Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.