We improve the convert code by rewriting the `get_typ`. It is now more
general and properly recurses on records and lists. This also surfaced a
bug where definition aliases did not generate correct code.
The `kind` and `apiVersion` properties of a Kubernetes resource are
already implicitly determined by the resource. We adjust the default
functions so that they do not require the `kind` and `apiVersion`
parameters for resources.
We obtain the implied values by inspecting the
`x-kubernetes-group-version-kind` key from the OpenAPI schema for that
resource. The [Kubernetes OpenAPI Spec Readme][1] explains how these
values determine the resource values.
[1]: https://github.com/kubernetes/kubernetes/blob/master/api/openapi-spec/README.md#x-kubernetes-group-version-kind
