code: def get_all_build_configs_by_labels(self, label_selectors):
          
          labels = ['%s=%s' % (field, value) for field, value in label_selectors]
          labels = ','.join(labels)
          url = self._build_url("buildconfigs/", labelSelector=labels)
          return self._get(url).json()['items']
docs: Returns all builds matching a given set of label selectors. It is up to the
          calling function to filter the results.