✨ Remove 'default' fields from v1beta1 CRDs

[munnerz]

It is not valid to specify default field values in v1beta1 CRDs.

This pull request strips the generated openapi schema of all instances of default being specified.

My only issue with this implementation is that it is non-obvious to users that this has happened, which could cause unexpected behaviour.

Fixes #445

related #480

[munnerz]

I'm looking into ways we can write a unit/integration test for this, similar to parser_integration_test.go. The issue is that the parser tests do not call Generator.Generate (defined in gen.go), so I'll need to write a new gen_test.go file which brings up a Generator and compares the output of the generated content to ensure that the defaults field is stripped when writing v1beta1.

[pwittrock]

/lgtm
/approve

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[DirectXMan12]

In the future, let's not merge things like this w/o tests :-/.
See also: #446 (review)

[DirectXMan12]

@munnerz can you do a follow up with a) a warning, and b) tests?
They can be separate PR if the warning is quicker.

[kevindelgado]

Hey @munnerz I'm gonna try adding the warning/test mentioned by Solly above if you're not already working on it. Just wanted to check and make sure I'm not stepping on your toes.