Use jemalloc in rocksdbjni library built via vagrant
Use jemalloc in rocksdbjni library built via vagrant

Summary:
Problem:
During RocksJava performance testing we found that the rocksdb jni library is not built with jemalloc; instead it was getting built with the default glibc malloc. We saw quite a bit of memory bloat due to this.

Addressed this by installing jemalloc-devel package in the vm that we use to build release jars.
Closes https://github.com/facebook/rocksdb/pull/2916

Differential Revision: D5887018

Pulled By: sagar0

fbshipit-source-id: ace0b5d60234b3a30dcd5d39633e7827a5982a50

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