Replacing rocksdb by leveldb in Makefile
Replacing rocksdb by leveldb in Makefile

Summary: Since we are keeping 'leveldb' instead of 'rocksdb' in third-party, this is only logical.

Test Plan: make clean;make

Reviewers: sheki, dhruba, haobo

Reviewed By: dhruba

CC: leveldb

Differential Revision: https://reviews.facebook.net/D10719

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