v0.3.0 release changes

[aiyengar2]

Resolves https://github.com/rancher/charts-build-scripts/issues/35, https://github.com/rancher/charts-build-scripts/issues/46, https://github.com/rancher/charts-build-scripts/issues/56, https://github.com/rancher/charts-build-scripts/issues/61, https://github.com/rancher/charts-build-scripts/issues/62, https://github.com/rancher/charts-build-scripts/issues/63

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https://github.com/rancher/charts-build-scripts/issues/54 is technically resolved, but not done in the way prescribed in the issue. Since we are moving to a newer system-charts model, there's no definition of what "validating charts" are, so instead the new behavior is to force a failure on validation if a chart is not included in the release.yaml.

Therefore, when rebasing charts, a developer will:

• Try to do the rebase
• See make validate fail
• Update the release.yaml; the hope is that a developer would also catch here that the older, unrebased, unreleased version of the chart still exists
• Remove the old chart with the new make remove command.

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https://github.com/rancher/charts-build-scripts/issues/33 is no longer a concern since we just flat-out do not allow comments in Chart.yaml anymore. It will be overwritten on a make prepare, since that's what would happen when we run a helm package anyways on the chart.

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Related Issue: https://github.com/rancher/charts-build-scripts/issues/60

[aiyengar2]

package-ci finally passed! Seems like this PR is good to go without any further changes, other than those pointed out during a review.

[aiyengar2]

Thanks for the comments @jiaqiluo! Ready for a re-review here.

I resolved all the comments where I just took your changes verbatim.

For anything else, I left comments and left unresolved above; feel free to resolve them if you agree or comment if you disagree.

All changes you suggested have been added to the last two commits I just pushed.

[aiyengar2]

~need to address edge cases brought up in https://github.com/rancher/charts-build-scripts/pull/66#pullrequestreview-809043347 around tgz files within CRD charts being modified...~

Done