@abc.abstractmethod
    def _del_tree(self, path, transaction):
Update rpc_node based on changed fields in a node.
dataset/ETHPy150Open openstack/taskflow/taskflow/persistence/path_based.py/PathBasedConnection._del_tree--crossover with--dataset/ETHPy150Open openstack/ironic/ironic/api/controllers/v1/node.py/NodesController._update_changed_fields