code: def validate_rmq_ssl_disabled_units(self, sentry_units):
          
          for sentry_unit in sentry_units:
              if self.rmq_ssl_is_enabled_on_unit(sentry_unit):
                  return ('Unexpected condition:  ssl is enabled on unit '
                          '({})'.format(sentry_unit.info['unit_name']))
          return None
docs: Check that ssl is enabled on listed rmq juju sentry units.
  
          :param sentry_units: list of all rmq sentry units
          :returns: True if successful.  Raise on error.