fix bug in P2PBroadcast, wrong hostname.
fix bug in P2PBroadcast, wrong hostname.

delete object when clear broadcast

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