WIP: upgrade openapi generator to v5.1.1

[roycaihw]

What type of PR is this?

/kind feature

What this PR does / why we need it:

This PR builds on top of #1478.

Upgrade openapi-generator to v5.1.1, to include upstream new features and bug fixes.

Note that the python generator is used, which contains a huge refactoring and uses python3 only: OpenAPITools/openapi-generator#7965

Which issue(s) this PR fixes:

Fixes #1421

Does this PR introduce a user-facing change?

[k8s-ci-robot]

@roycaihw: Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: roycaihw

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[k8s-ci-robot]

@roycaihw: PR needs rebase.

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/lifecycle stale

[roycaihw]

/close

Will give it another try in latest master

[k8s-ci-robot]

@roycaihw: Closed this PR.

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In response to this:

/close

Will give it another try in latest master

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.