Release note for partition filters
Release note for partition filters

Summary:
I tagged it experimental since the configuring the filter partitions by size will not be ready for this release.
Closes https://github.com/facebook/rocksdb/pull/2049

Differential Revision: D4831575

Pulled By: maysamyabandeh

fbshipit-source-id: fcc2d25

Andymic/rocksdb,Andymic/rocksdb,vmx/rocksdb,bbiao/rocksdb,bbiao/rocksdb,Andymic/rocksdb,SunguckLee/RocksDB,bbiao/rocksdb,SunguckLee/RocksDB,bbiao/rocksdb,Andymic/rocksdb,SunguckLee/RocksDB,Andymic/rocksdb,bbiao/rocksdb,bbiao/rocksdb,Andymic/rocksdb,vmx/rocksdb,SunguckLee/RocksDB,vmx/rocksdb,SunguckLee/RocksDB,vmx/rocksdb,SunguckLee/RocksDB,bbiao/rocksdb,vmx/rocksdb,SunguckLee/RocksDB,Andymic/rocksdb,bbiao/rocksdb,Andymic/rocksdb,vmx/rocksdb,vmx/rocksdb,SunguckLee/RocksDB,vmx/rocksdb