docs: def iter_master_options(self, master_id=None):
          '''
          Iterate (in order) over your options for master
          '''
          masters = list(self._syndics.keys())
          if self.opts['syndic_failover'] == 'random':
              shuffle(masters)
          if master_id not in self._syndics:
              master_id = masters.pop(0)
          else:
              masters.remove(master_id)
  
          while True:
              yield master_id, self._syndics[master_id]
              if not masters:
                  break
              master_id = masters.pop(0)