[Rocksdb] Simplify Printing code in db_bench
[Rocksdb] Simplify Printing code in db_bench

Summary:
simplify the printing code in db_bench
         use TickersMap and HistogramsNameMap introduced in previous diffs.

Test Plan: ./db_bench --statistics=1 and see if all the statistics are printed

Reviewers: haobo, dhruba

Reviewed By: haobo

CC: leveldb

Differential Revision: https://reviews.facebook.net/D11355

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