Use v1 Ingresses when available

[LCaparelli]

Fix #180

[LCaparelli]

Actually, I just realized in the shower there's a bug in this. It's not enough to match Group and Version (as we have been doing so far). We must match Group, Version and Kind. In previous versions of K8s, such as 1.16, has k8s.io/api/networking/v1 but Ingress is not one of the available Kinds in this version.

EDIT: I fixed discovery locally, but it broke the fake client. I'll work on this tomorrow. Adding the WIP label, no review required for now.

[ricardozanini]

A few comments about the desing :D
Tell me what you think. I believe we can stretch the release a little bit to include this PR on 0.4.0.

[LCaparelli]

Thanks for reviewing @ricardozanini, I just pushed another commit fixing discovery in case you want to check it out. I'll work on the suggestion :-)

[LCaparelli]

@ricardozanini any other suggestions, concerns or nitpicks? :-)

[ricardozanini]

I believe we can merge by the end of the day. Tomorrow morning I'll update the image and the manifest, so we can run the tests during the weekend to release 0.4.0.

[Kaitou786]

This is nice!