Cleanup of ManagedOSVersion orphans

[mudler]

At the moment ManagedOSVersion created by the controller don't have an owner set, so cleaning up a ManagedOSVersionChannel doesn't cleanup available versions.

Ideally we should set the VersionChannel as owner of ManagedOSVersion, allowing the resources to be cleaned up in cascade.

e.g. when creating the resource

OwnerReferences: []metav1.OwnerReference{
		*metav1.NewControllerRef(..., schema.GroupVersionKind{
			Group:   v1alpha1.SchemeGroupVersion.Group,
			Version: v1alpha1.SchemeGroupVersion.Version,
			Kind:    "...",
		}),
	},

Follow up of : #14

[davidcassany]

I am starting to have a look at this one