Change db_stress to work with format_version == 2
Change db_stress to work with format_version == 2

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