dev branch produces invalid Open api specification

[demeringo]

Bug description

There are some invalid fields in OAS spec of API v0.3.x (dev branch) that prevent validation (or sdk code generation).

To Reproduce

Open the swagger UI, and try to execute the default get route of server archetype config (GET /v1/server/archetype_config )

The value provided by default in the UI is wrong (default query fails).

Online validation of the generated OpenAPI spec as json also fails.

Expected behavior

JSON OUTPUT

Additional context

[da-ekchajzer]

@demeringo the PR is merged. Does it fix this issue?