Improve listener_test to avoid possible false alarm
Improve listener_test to avoid possible false alarm

Summary:
Improve listener_test to avoid possible false alarm

Test Plan:
./listener_test

wenduo/rocksdb,wenduo/rocksdb,dkorolev/rocksdb,siddhartharay007/rocksdb,SunguckLee/RocksDB,sorphi/rocksdb,RyanTech/rocksdb,Applied-Duality/rocksdb,fengshao0907/rocksdb,Andymic/rocksdb,JohnPJenkins/rocksdb,RyanTech/rocksdb,ryneli/rocksdb,sorphi/rocksdb,alihalabyah/rocksdb,JoeWoo/rocksdb,hobinyoon/rocksdb,alihalabyah/rocksdb,fengshao0907/rocksdb,flabby/rocksdb,tsheasha/rocksdb,bbiao/rocksdb,temicai/rocksdb,norton/rocksdb,amyvmiwei/rocksdb,tsheasha/rocksdb,Andymic/rocksdb,vmx/rocksdb,JackLian/rocksdb,NickCis/rocksdb,ryneli/rocksdb,Applied-Duality/rocksdb,norton/rocksdb,sorphi/rocksdb,mbarbon/rocksdb,virtdb/rocksdb,caijieming-baidu/rocksdb,anagav/rocksdb,bbiao/rocksdb,SunguckLee/RocksDB,JohnPJenkins/rocksdb,rDSN-Projects/rocksdb.replicated,mbarbon/rocksdb,biddyweb/rocksdb,wskplho/rocksdb,vmx/rocksdb,ryneli/rocksdb,bbiao/rocksdb,wat-ze-hex/rocksdb,norton/rocksdb,makelivedotnet/rocksdb,facebook/rocksdb,tsheasha/rocksdb,kaschaeffer/rocksdb,JackLian/rocksdb,alihalabyah/rocksdb,Applied-Duality/rocksdb,JohnPJenkins/rocksdb,tizzybec/rocksdb,wlqGit/rocksdb,norton/rocksdb,ryneli/rocksdb,JohnPJenkins/rocksdb,luckywhu/rocksdb,rDSN-Projects/rocksdb.replicated,tsheasha/rocksdb,jalexanderqed/rocksdb,anagav/rocksdb,virtdb/rocksdb,wenduo/rocksdb,JohnPJenkins/rocksdb,rDSN-Projects/rocksdb.replicated,tizzybec/rocksdb,amyvmiwei/rocksdb,norton/rocksdb,wenduo/rocksdb,bbiao/rocksdb,jalexanderqed/rocksdb,Applied-Duality/rocksdb,wlqGit/rocksdb,facebook/rocksdb,biddyweb/rocksdb,geraldoandradee/rocksdb,fengshao0907/rocksdb,flabby/rocksdb,caijieming-baidu/rocksdb,rDSN-Projects/rocksdb.replicated,siddhartharay007/rocksdb,luckywhu/rocksdb,kaschaeffer/rocksdb,JohnPJenkins/rocksdb,mbarbon/rocksdb,kaschaeffer/rocksdb,NickCis/rocksdb,IMCG/RcoksDB,JackLian/rocksdb,IMCG/RcoksDB,facebook/rocksdb,ylong/rocksdb,flabby/rocksdb,wenduo/rocksdb,flabby/rocksdb,Vaisman/rocksdb,JackLian/rocksdb,Andymic/rocksdb,vmx/rocksdb,ylong/rocksdb,wlqGit/rocksdb,tizzybec/rocksdb,rDSN-Projects/rocksdb.replicated,lgscofield/rocksdb,wskplho/rocksdb,siddhartharay007/rocksdb,jalexanderqed/rocksdb,vashstorm/rocksdb,wat-ze-hex/rocksdb,fengshao0907/rocksdb,kaschaeffer/rocksdb,fengshao0907/rocksdb,dkorolev/rocksdb,caijieming-baidu/rocksdb,ylong/rocksdb,JoeWoo/rocksdb,virtdb/rocksdb,OverlordQ/rocksdb,norton/rocksdb,IMCG/RcoksDB,zhangpng/rocksdb,IMCG/RcoksDB,bbiao/rocksdb,vashstorm/rocksdb,wskplho/rocksdb,mbarbon/rocksdb,virtdb/rocksdb,vmx/rocksdb,facebook/rocksdb,JackLian/rocksdb,caijieming-baidu/rocksdb,luckywhu/rocksdb,amyvmiwei/rocksdb,luckywhu/rocksdb,wat-ze-hex/rocksdb,wskplho/rocksdb,lgscofield/rocksdb,rDSN-Projects/rocksdb.replicated,zhangpng/rocksdb,flabby/rocksdb,anagav/rocksdb,vashstorm/rocksdb,amyvmiwei/rocksdb,skunkwerks/rocksdb,JoeWoo/rocksdb,lgscofield/rocksdb,luckywhu/rocksdb,tizzybec/rocksdb,tizzybec/rocksdb,wlqGit/rocksdb,hobinyoon/rocksdb,ylong/rocksdb,mbarbon/rocksdb,facebook/rocksdb,vashstorm/rocksdb,siddhartharay007/rocksdb,anagav/rocksdb,temicai/rocksdb,biddyweb/rocksdb,makelivedotnet/rocksdb,hobinyoon/rocksdb,alihalabyah/rocksdb,makelivedotnet/rocksdb,zhangpng/rocksdb,flabby/rocksdb,temicai/rocksdb,luckywhu/rocksdb,wat-ze-hex/rocksdb,amyvmiwei/rocksdb,anagav/rocksdb,anagav/rocksdb,vmx/rocksdb,rDSN-Projects/rocksdb.replicated,Vaisman/rocksdb,vashstorm/rocksdb,temicai/rocksdb,geraldoandradee/rocksdb,ryneli/rocksdb,Andymic/rocksdb,wskplho/rocksdb,IMCG/RcoksDB,jalexanderqed/rocksdb,ylong/rocksdb,Applied-Duality/rocksdb,RyanTech/rocksdb,makelivedotnet/rocksdb,alihalabyah/rocksdb,vmx/rocksdb,temicai/rocksdb,JackLian/rocksdb,bbiao/rocksdb,OverlordQ/rocksdb,vashstorm/rocksdb,JoeWoo/rocksdb,hobinyoon/rocksdb,wlqGit/rocksdb,wat-ze-hex/rocksdb,norton/rocksdb,geraldoandradee/rocksdb,OverlordQ/rocksdb,dkorolev/rocksdb,wat-ze-hex/rocksdb,lgscofield/rocksdb,siddhartharay007/rocksdb,lgscofield/rocksdb,hobinyoon/rocksdb,zhangpng/rocksdb,wenduo/rocksdb,fengshao0907/rocksdb,caijieming-baidu/rocksdb,jalexanderqed/rocksdb,wskplho/rocksdb,NickCis/rocksdb,vashstorm/rocksdb,dkorolev/rocksdb,Andymic/rocksdb,wlqGit/rocksdb,virtdb/rocksdb,skunkwerks/rocksdb,lgscofield/rocksdb,Andymic/rocksdb,Vaisman/rocksdb,makelivedotnet/rocksdb,Vaisman/rocksdb,OverlordQ/rocksdb,NickCis/rocksdb,NickCis/rocksdb,lgscofield/rocksdb,vmx/rocksdb,geraldoandradee/rocksdb,Andymic/rocksdb,wskplho/rocksdb,tsheasha/rocksdb,IMCG/RcoksDB,kaschaeffer/rocksdb,amyvmiwei/rocksdb,geraldoandradee/rocksdb,jalexanderqed/rocksdb,SunguckLee/RocksDB,JoeWoo/rocksdb,SunguckLee/RocksDB,sorphi/rocksdb,wenduo/rocksdb,caijieming-baidu/rocksdb,facebook/rocksdb,Vaisman/rocksdb,dkorolev/rocksdb,geraldoandradee/rocksdb,zhangpng/rocksdb,ylong/rocksdb,RyanTech/rocksdb,biddyweb/rocksdb,sorphi/rocksdb,RyanTech/rocksdb,skunkwerks/rocksdb,dkorolev/rocksdb,amyvmiwei/rocksdb,temicai/rocksdb,dkorolev/rocksdb,skunkwerks/rocksdb,ryneli/rocksdb,wat-ze-hex/rocksdb,sorphi/rocksdb,kaschaeffer/rocksdb,biddyweb/rocksdb,wat-ze-hex/rocksdb,zhangpng/rocksdb,biddyweb/rocksdb,mbarbon/rocksdb,anagav/rocksdb,Vaisman/rocksdb,mbarbon/rocksdb,skunkwerks/rocksdb,tsheasha/rocksdb,SunguckLee/RocksDB,caijieming-baidu/rocksdb,OverlordQ/rocksdb,sorphi/rocksdb,alihalabyah/rocksdb,siddhartharay007/rocksdb,wlqGit/rocksdb,wenduo/rocksdb,OverlordQ/rocksdb,biddyweb/rocksdb,flabby/rocksdb,NickCis/rocksdb,kaschaeffer/rocksdb,facebook/rocksdb,tsheasha/rocksdb,Andymic/rocksdb,virtdb/rocksdb,ylong/rocksdb,makelivedotnet/rocksdb,norton/rocksdb,Applied-Duality/rocksdb,temicai/rocksdb,Applied-Duality/rocksdb,jalexanderqed/rocksdb,virtdb/rocksdb,zhangpng/rocksdb,skunkwerks/rocksdb,hobinyoon/rocksdb,alihalabyah/rocksdb,JohnPJenkins/rocksdb,hobinyoon/rocksdb,luckywhu/rocksdb,geraldoandradee/rocksdb,makelivedotnet/rocksdb,JoeWoo/rocksdb,bbiao/rocksdb,SunguckLee/RocksDB,Vaisman/rocksdb,RyanTech/rocksdb,tsheasha/rocksdb,vmx/rocksdb,siddhartharay007/rocksdb,skunkwerks/rocksdb,RyanTech/rocksdb,hobinyoon/rocksdb,tizzybec/rocksdb,ryneli/rocksdb,SunguckLee/RocksDB,OverlordQ/rocksdb,IMCG/RcoksDB,SunguckLee/RocksDB,JackLian/rocksdb,tizzybec/rocksdb,facebook/rocksdb,bbiao/rocksdb,fengshao0907/rocksdb,JoeWoo/rocksdb,NickCis/rocksdb