Add security schemes and requirements to generated OpenAPI spec

[mansam]

In order for autogenerated OpenAPI clients to be able to authenticate with the Hub, we need to specify the security scheme and requirements in our OpenAPI spec. Swagger/OpenAPI2 does not appear to have a bearer auth type, so our current process of generating OpenAPI2 and then converting it to OpenAPI3 will likely not work here.

[konveyor-ci-bot]

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[github-actions]

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