ISSUE-205 Is TestIngest PG_VERSION Class Variable required?

[lewismc]

Addresses #205

[lewismc]

@renato2099 as discussed on our call, I will address the remaining OpenAPI warnings and then push this issue. We can then release 0.10.0

[lewismc]

This PR rolls in some OpenAPI syntactic changes which were required to stabilize the CI builds. This is the result of the IBM OpenAPI validator and linter which we use to quality control the OpenAPI, changing in such a way that we had to address errors and warnings.
You will note that although there are changes to the OpenAPI spec, I have NOT regenerated the python-flask project yet. This is because no functionality has changed... only the OpenAPI convention.
We can regenerate the python-flask project the next time we make functional changes to the OpenAPI spec e.g. #181