Fix memory leak in KeyMayExist test part of db_test
Fix memory leak in KeyMayExist test part of db_test

Summary: NewBloomFilterPolicy call requires Delete to be called later on

Test Plan: make; valgrind ./db_test

Reviewers: haobo, dhruba, vamsi

Differential Revision: https://reviews.facebook.net/D11667

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