docs: def teardown_databases(self, old_config, options):
          """
          Destroys all the non-mirror databases.
          """
          if len(old_config) > 1:
              old_names, mirrors = old_config
          else:
              old_names = old_config
          for connection, old_name, destroy in old_names:
              if destroy:
                  connection.creation.destroy_test_db(old_name, options['verbosity'])