Changes to Get Journey Parameters

added the new optional header request parameter alloy-journey-version to all path's operations

added the media type application/json for the response with the status 401

added the media type application/json for the response with the status 404

added the media type application/json for the response with the status 429

added the media type application/json for the response with the status 500

added the media type application/json for the response with the status 503