code: public Observable<List<String>> listUsageScenariosAsync() {
          return listUsageScenariosWithServiceResponseAsync().map(new Func1<ServiceResponse<List<String>>, List<String>>() {
              @Override
              public List<String> call(ServiceResponse<List<String>> response) {
                  return response.body();
              }
          });
      }
docs: Gets the application available usage scenarios.
  
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the List&lt;String&gt; object