Controller and group controllers should be optional

[cyga]

There was already a request for it here. However, it was automatically closed.

In my case we don't really use controller or group controller services.
Nonetheless, I ended up specifying dummy ones to use this testing library for other functionality I have.

[pohly]

/close

I reopened the older one.

[k8s-ci-robot]

@pohly: Closing this issue.

In response to this:

/close

I reopened the older one.

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