Some small refactorings on table_test
Some small refactorings on table_test

Summary:

Just revise some hard-to-read or unnecessarily verbose code.

Test Plan:

make check

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