code: public Observable<Service> addService(final AddServiceRequest request) {
          LOGGER.debug("Got instructed to add Service {}, to Node {}", request.type(), request.hostname());
          return nodeBy(request.hostname()).addService(request);
      }
docs: Add the service to the node.
  
  @param request the request which contains infos about the service and node to add.
  @return an observable which contains the newly created service.