Add Cloudera's blog post to USERS.md
Add Cloudera's blog post to USERS.md

Summary: As title

Test Plan: none

Reviewers: yhchiang, rven, anthony, IslamAbdelRahman, kradhakrishnan, sdong

Reviewed By: sdong

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D46053

hobinyoon/rocksdb,Andymic/rocksdb,wenduo/rocksdb,JohnPJenkins/rocksdb,biddyweb/rocksdb,geraldoandradee/rocksdb,tsheasha/rocksdb,facebook/rocksdb,RyanTech/rocksdb,biddyweb/rocksdb,norton/rocksdb,geraldoandradee/rocksdb,JackLian/rocksdb,Andymic/rocksdb,JoeWoo/rocksdb,kaschaeffer/rocksdb,hobinyoon/rocksdb,SunguckLee/RocksDB,OverlordQ/rocksdb,luckywhu/rocksdb,JackLian/rocksdb,flabby/rocksdb,OverlordQ/rocksdb,geraldoandradee/rocksdb,wat-ze-hex/rocksdb,tsheasha/rocksdb,JoeWoo/rocksdb,jalexanderqed/rocksdb,JoeWoo/rocksdb,JohnPJenkins/rocksdb,ryneli/rocksdb,flabby/rocksdb,OverlordQ/rocksdb,flabby/rocksdb,vashstorm/rocksdb,bbiao/rocksdb,caijieming-baidu/rocksdb,wat-ze-hex/rocksdb,bbiao/rocksdb,wat-ze-hex/rocksdb,vashstorm/rocksdb,wlqGit/rocksdb,dkorolev/rocksdb,dkorolev/rocksdb,biddyweb/rocksdb,flabby/rocksdb,luckywhu/rocksdb,JackLian/rocksdb,JoeWoo/rocksdb,hobinyoon/rocksdb,wat-ze-hex/rocksdb,tsheasha/rocksdb,vashstorm/rocksdb,bbiao/rocksdb,tsheasha/rocksdb,kaschaeffer/rocksdb,Andymic/rocksdb,vmx/rocksdb,SunguckLee/RocksDB,wenduo/rocksdb,JoeWoo/rocksdb,wenduo/rocksdb,RyanTech/rocksdb,facebook/rocksdb,norton/rocksdb,vmx/rocksdb,ryneli/rocksdb,siddhartharay007/rocksdb,siddhartharay007/rocksdb,caijieming-baidu/rocksdb,JackLian/rocksdb,caijieming-baidu/rocksdb,vmx/rocksdb,ryneli/rocksdb,wat-ze-hex/rocksdb,bbiao/rocksdb,Andymic/rocksdb,siddhartharay007/rocksdb,norton/rocksdb,JohnPJenkins/rocksdb,facebook/rocksdb,luckywhu/rocksdb,vashstorm/rocksdb,hobinyoon/rocksdb,JohnPJenkins/rocksdb,tsheasha/rocksdb,tsheasha/rocksdb,JackLian/rocksdb,ryneli/rocksdb,Vaisman/rocksdb,norton/rocksdb,wenduo/rocksdb,wat-ze-hex/rocksdb,geraldoandradee/rocksdb,tsheasha/rocksdb,jalexanderqed/rocksdb,RyanTech/rocksdb,flabby/rocksdb,facebook/rocksdb,siddhartharay007/rocksdb,biddyweb/rocksdb,luckywhu/rocksdb,jalexanderqed/rocksdb,bbiao/rocksdb,vmx/rocksdb,Andymic/rocksdb,vmx/rocksdb,kaschaeffer/rocksdb,wlqGit/rocksdb,JoeWoo/rocksdb,SunguckLee/RocksDB,OverlordQ/rocksdb,caijieming-baidu/rocksdb,biddyweb/rocksdb,bbiao/rocksdb,OverlordQ/rocksdb,luckywhu/rocksdb,tsheasha/rocksdb,dkorolev/rocksdb,facebook/rocksdb,vmx/rocksdb,facebook/rocksdb,OverlordQ/rocksdb,kaschaeffer/rocksdb,siddhartharay007/rocksdb,wlqGit/rocksdb,siddhartharay007/rocksdb,SunguckLee/RocksDB,caijieming-baidu/rocksdb,Vaisman/rocksdb,Andymic/rocksdb,dkorolev/rocksdb,vashstorm/rocksdb,ryneli/rocksdb,Vaisman/rocksdb,wlqGit/rocksdb,hobinyoon/rocksdb,Andymic/rocksdb,facebook/rocksdb,kaschaeffer/rocksdb,ryneli/rocksdb,wenduo/rocksdb,wlqGit/rocksdb,wlqGit/rocksdb,hobinyoon/rocksdb,wenduo/rocksdb,geraldoandradee/rocksdb,JackLian/rocksdb,JackLian/rocksdb,JohnPJenkins/rocksdb,Vaisman/rocksdb,siddhartharay007/rocksdb,RyanTech/rocksdb,norton/rocksdb,caijieming-baidu/rocksdb,wlqGit/rocksdb,jalexanderqed/rocksdb,RyanTech/rocksdb,SunguckLee/RocksDB,wat-ze-hex/rocksdb,biddyweb/rocksdb,wenduo/rocksdb,RyanTech/rocksdb,luckywhu/rocksdb,Andymic/rocksdb,norton/rocksdb,hobinyoon/rocksdb,norton/rocksdb,biddyweb/rocksdb,norton/rocksdb,JohnPJenkins/rocksdb,Vaisman/rocksdb,wenduo/rocksdb,bbiao/rocksdb,bbiao/rocksdb,jalexanderqed/rocksdb,Vaisman/rocksdb,ryneli/rocksdb,wat-ze-hex/rocksdb,hobinyoon/rocksdb,SunguckLee/RocksDB,SunguckLee/RocksDB,caijieming-baidu/rocksdb,JoeWoo/rocksdb,dkorolev/rocksdb,vashstorm/rocksdb,vmx/rocksdb,luckywhu/rocksdb,vmx/rocksdb,flabby/rocksdb,JohnPJenkins/rocksdb,kaschaeffer/rocksdb,jalexanderqed/rocksdb,facebook/rocksdb,geraldoandradee/rocksdb,SunguckLee/RocksDB,dkorolev/rocksdb,Vaisman/rocksdb,flabby/rocksdb,dkorolev/rocksdb,RyanTech/rocksdb,geraldoandradee/rocksdb,kaschaeffer/rocksdb,jalexanderqed/rocksdb,vashstorm/rocksdb,OverlordQ/rocksdb