change the order when shutdown
change the order when shutdown

terminate worker first, then clean work dir.

douban/dpark,douban/dpark,yanheven/dpark,Mignet/dpark,smarthomekit/dpark,304471720/dpark,304471720/dpark,dogeyes/dpark,yanheven/dpark,windreamer/dpark,veritynoob/dpark,oceanjack/dpark,ee08b397/dpark,quxiaolong1504/dpark,quxiaolong1504/dpark,daishaowei/dpark,oceanjack/dpark,dogeyes/dpark,windreamer/dpark,smarthomekit/dpark,mageia/dpark,smarthomekit/dpark,junmoa/dpark,douban/dpark,windreamer/dpark,304471720/dpark,zzl0/dpark,fe11x/dpark,Mignet/dpark,mageia/dpark,windreamer/dpark,dogeyes/dpark,fe11x/dpark,douban/dpark,zzl0/dpark,veritynoob/dpark,junmoa/dpark,veritynoob/dpark,yhj630520/dpark,douban/dpark,daishaowei/dpark,yhj630520/dpark,yhj630520/dpark