Custom errors raised in Python microservice don't make it back to the client

[ahutterTA]

Using a UserCustomException in a Python microservice results in the engine intercepting the exception, changing the status code to a 500 from whatever set by the microservice, and dropping the payload. The engine returns:

{
  "code": 203,
  "info": "org.springframework.web.client.HttpClientErrorException: 400 BAD REQUEST",
  "reason": "Microservice error",
  "status": "FAILURE"
}

It should return the payload created by the microservice.

[axsaucedo]

@cliveseldon this may be fixed with the executor?