code: public Observable<UsagesListResultInner> listUsagesAsync(String location) {
          return listUsagesWithServiceResponseAsync(location).map(new Func1<ServiceResponse<UsagesListResultInner>, UsagesListResultInner>() {
              @Override
              public UsagesListResultInner call(ServiceResponse<UsagesListResultInner> response) {
                  return response.body();
              }
          });
      }
docs: Lists the usages for the specified location.
  
  @param location The location to get capabilities for.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the UsagesListResultInner object