Issue Description: 

Validation within RHOSE's public API endpoints has the potential to return multiple errors. For this reason we worked on support for a ErrorsResponse. However the methods themselves still have the potential to return a single ErrorResponse object. This makes defining rhose-api.yaml compliant with AppServices impossible as a single response type must be defined.

The backend is being refactored to return ErrorsReponse in all cases. The UI will need modification to expect the same.

Acceptance Criteria:

UI changes to support the new response structure.

Out of Scope: 

Backend re-work.

Additional Information: 

See here for the discussion.