Kustomize Patch Support for coredns-operator base manifests

[stealthybox]

Users should be able to include arbitrary patches to operator resources.
One use-case would be to mutate the Service to annotate it for an ingress-controller.

@johnsonj is working on implementing Kustomize style patch support:

justinsb#1
kubernetes-sigs/kubebuilder-declarative-pattern#44

We should get the operator side of things merged into #7 either in justin's repo before merge.
We can also just re-open the PR on this repo which unblocks merging #7.

[dholbach]

@johnsonj In #18 you say that it updates this issue. Could we break down what needs to be done here?

[johnsonj]

I think this should be closed at this point. There's lots of ways forward for patching but I believe the exploratory CL covers this issue.

[dholbach]

Super, thanks @johnsonj!