🌱 Create RemoveOwnerReference function in controllerutil to remove owner references from objects

[troy0820]

When using the function SetControllerReference it will error when trying to overwrite the controller reference. In issue #2381 the method used to circumvent the errors is to remove the controller reference and then reapply the new controller reference. There is no exposed method to do this. This mimics the behavior of removing a finalizer

Creating this function allows a user to remove the owner reference of an object.
Also helps with #2381

• Create function that removes owner reference from object (similar to remove finalizer)
• Create unit test for function

Add function RemoveOwnerReference to pkg/controller/controllerutil 
to allow the removal of the owner reference of the controlled object.```

[k8s-ci-robot]

Hi @troy0820. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

I understand the commands that are listed here.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[sbueringer]

lgtm pending the linter findings

[sbueringer]

Thank you!

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: sbueringer, troy0820

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [sbueringer]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment