Increase RocksDB version
Increase RocksDB version

Summary: RocksDB 4.11 has been branched out. Now need to move to 4.12.

Test Plan: N/A

Reviewers: kradhakrishnan, andrewkr, IslamAbdelRahman

Reviewed By: IslamAbdelRahman

Subscribers: leveldb, andrewkr, dhruba

Differential Revision: https://reviews.facebook.net/D61845

SunguckLee/RocksDB,tsheasha/rocksdb,bbiao/rocksdb,Andymic/rocksdb,vmx/rocksdb,tsheasha/rocksdb,norton/rocksdb,OverlordQ/rocksdb,SunguckLee/RocksDB,bbiao/rocksdb,SunguckLee/RocksDB,wat-ze-hex/rocksdb,facebook/rocksdb,SunguckLee/RocksDB,SunguckLee/RocksDB,bbiao/rocksdb,norton/rocksdb,Andymic/rocksdb,Andymic/rocksdb,vmx/rocksdb,wat-ze-hex/rocksdb,facebook/rocksdb,SunguckLee/RocksDB,wenduo/rocksdb,OverlordQ/rocksdb,Andymic/rocksdb,bbiao/rocksdb,Andymic/rocksdb,bbiao/rocksdb,norton/rocksdb,vmx/rocksdb,bbiao/rocksdb,norton/rocksdb,tsheasha/rocksdb,tsheasha/rocksdb,OverlordQ/rocksdb,Andymic/rocksdb,wenduo/rocksdb,wat-ze-hex/rocksdb,vmx/rocksdb,norton/rocksdb,tsheasha/rocksdb,wenduo/rocksdb,wat-ze-hex/rocksdb,facebook/rocksdb,wat-ze-hex/rocksdb,vmx/rocksdb,wenduo/rocksdb,vmx/rocksdb,wat-ze-hex/rocksdb,OverlordQ/rocksdb,wat-ze-hex/rocksdb,OverlordQ/rocksdb,wenduo/rocksdb,facebook/rocksdb,Andymic/rocksdb,facebook/rocksdb,Andymic/rocksdb,norton/rocksdb,wenduo/rocksdb,norton/rocksdb,bbiao/rocksdb,wat-ze-hex/rocksdb,tsheasha/rocksdb,tsheasha/rocksdb,SunguckLee/RocksDB,SunguckLee/RocksDB,tsheasha/rocksdb,facebook/rocksdb,wenduo/rocksdb,vmx/rocksdb,vmx/rocksdb,wenduo/rocksdb,norton/rocksdb,facebook/rocksdb,bbiao/rocksdb,OverlordQ/rocksdb,OverlordQ/rocksdb,facebook/rocksdb