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Fake clientset propagates namespace to objects on create/update
**What this PR does / why we need it**:
Unlike the real Clientset, the fake Clientset requires creates and updates of namespaced objects to have the namespace specified in the target runtime object metadata. This difference forces API clients using the fake Clientset for test to propagate the namespaces to the runtime objects in the production code. This propagation is unnecessary and should be handled by the fake implementation.
**Which issue this PR fixes**: fixeskubernetes/client-go#48
**Special notes for your reviewer**:
**Release note**:
NONE
Automatic merge from submit-queue
Add godoc on using FakeClient with subresources
Add a little godoc on using FakeClient with subresources, hoping to prevent future occurences of #32127.
Using new fake clientset registry exposes the actual flow on pending
namespace finalization: get namespace, create finalizer, list pods and
delete namespace if there are no pods.
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.
Automatic merge from submit-queue
[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.
```
