fix a bug for jobmaker: zookeeper will destruct after get the lock.
fix a bug for jobmaker: zookeeper will destruct after get the lock.

btccom/btcpool,btccom/btcpool,btccom/btcpool,btccom/btcpool,btccom/btcpool,btccom/btcpool,btccom/btcpool,btccom/btcpool