code: def _process_sasl_abort(self, stream, element):
          
          _unused, _unused = stream, element
          if not self.authenticator:
              logger.debug("Unexpected SASL response")
              return False
  
          self.authenticator = None
          logger.debug("SASL authentication aborted")
          return True
docs: Process incoming <sasl:abort/> element.
  
          [receiving entity only]