def all_keys(self):
        keys = self.list_keys()
        keys.update(self.local_keys())
        return keys
remove a successor from a node
dataset/ETHPy150Open saltstack/salt/salt/key.py/Key.all_keys--crossover with--dataset/ETHPy150Open kakwa/pygraph_redis/pygraph_redis/directed_graph.py/Directed_graph._remove_successor