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federation: Adding namespaces API
Adding namespaces API to federation-apiserver and updating the federation client to include namespaces
--------------------------
Original description:
This adds the namespaces API to federation-apiserver.
The first commit is https://github.com/kubernetes/kubernetes/pull/26142.
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Track object modifications in fake clientset
Fake clientset is used by unit tests extensively but it has some
shortcomings:
- no filtering on namespace and name: tests that want to test objects in
multiple namespaces end up getting all objects from this clientset,
as it doesn't perform any filtering based on name and namespace;
- updates and deletes don't modify the clientset state, so some tests
can get unexpected results if they modify/delete objects using the
clientset;
- it's possible to insert multiple objects with the same
kind/name/namespace, this leads to confusing behavior, as retrieval is
based on the insertion order, but anchors on the last added object as
long as no more objects are added.
This change changes core.ObjectRetriever implementation to track object
adds, updates and deletes.
Some unit tests were depending on the previous (and somewhat incorrect)
behavior. These are fixed in the following few commits.
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[client-gen]Add Patch to clientset
* add the Patch() method to the clientset.
* I have to rename the existing Patch() method of `Event` to PatchWithEventNamespace() to avoid overriding.
* some minor changes to the fake Patch action.
cc @Random-Liu since he asked for the method
@kubernetes/sig-api-machinery
ref #26580
```release-note
Add the Patch method to the generated clientset.
```
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Implement the cluster-controller of kubernetes federation
This PR is the cluster-controller of kubernetes federation.
This controller of federation phase 1 just collect the status of federated clusters.
