[TRQP-4] Change OpenAPI specifications to be bound to specifically RESTful implementation

[andorsk]

This is related to #52.

According to the current specification, there are components which are specifically bound to OpenAPI yaml. For example, TRQP-4 and the error codes in TRQP-5.

#52 proposes to add RDAP and DNS, which may require updates to the data models to comply with the protocol. RDAP resolves over HTTP, but the response models and accessors would need to look different to comply.

If we want to support multiple protocols, then TRQP-4 and 5 should probably be bound to a specific context (i.e RESTful), and allows variations depending on the profile.

[darrellodonnell]

Good catch.

re: #52 We should determine who is willing to do the RDAP/DNS work and if they will commit resources to moving things forward.