docs: def getList(self, listtype):
          '''
          listtype must be a Zooborg constant
          '''
          if listtype not in [ZooConst.CLIENT, ZooConst.WORKER, ZooConst.BROKER]:
              raise Exception('Zooborg.getList: invalid type')
          self.initconn()
          return self.zk.get_children('/distark/' + listtype + '/list')