Make @ControllerConfiguration Inherited

[BramMeerten]

When you register a Reconciler, and the Reconciler has the @ControllerConfiguration on a superclass, an error will be thrown:

myOperator.register(new MyReconciler());

class MyReconciler extends MySuper { }

@ControllerConfiguration
class MySuper implements Reconciler<MyResource> {}

This is the code that throws the exception (AnnotationControllerConfiguration.java):

this.annotation = reconciler.getClass().getAnnotation(ControllerConfiguration.class);
    if (annotation == null) {
      throw new OperatorException(
          "Missing mandatory @" + ControllerConfiguration.class.getSimpleName() +
              " annotation for reconciler:  " + reconciler);
    }

Solution is to add @Inherited to @ControllerConfiguration.

I'd be willing to contribute this change, if this is an acceptable enhancement.

Reason why this is needed in my case
I'm using micronaut framework. And when I inject my reconciler, I actually inject a proxy class that is a subclass of my Reconciler implementation (because I'm using micronaut AOP).

[BramMeerten]

I'm not able to change the label as requested in the contribution guideline:

please also open an issue describing your feature and label it "enhancement"

[metacosm]

I think that's a good idea to add @Inherited. I would actually consider it a bug that it's not already done! 😄