Updating ClusterProperty API to v1betav1

[holgerson97]

closes: #18

I upgrade the API files and adapted Makefile to support multiple CRD versions.
Is there more required to do to close issue #18?

NOTE Since I updated controller-gen in a different PR this one should probably merged afterwards and manifest freshly generated with new version.

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[ryanzhang-oss]

I am not sure if the About API is ready to move to v1beta1 yet. There are a bunch of properties that we would like to add.

[lauralorenz]

Thank you @holgerson97!!!! This is awesome!! I will catch up on these after Kubecon.

@ryanzhang-oss About API graduated to beta last year actually, but the repo hasn't caught up. Adding properties (if by that you mean, more records) is always possible; and well known properties can also be defined if that's what you mean.