Adding new build script for CentOS 7 (#6617)

Summary:
Updating build script for CentOS 7
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6617

Reviewed By: riversand963

Differential Revision: D20879268

Pulled By: anand1976

fbshipit-source-id: 414b99e39cd77ba31373ff7aff50121d78a93d1c

build_tools/setup_centos7.sh

@@ -1,9 +1,9 @@
 #!/bin/bash
 # Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
-set -e
+set -ex
 
-ROCKSDB_VERSION="5.10.3"
-ZSTD_VERSION="1.1.3"
+ROCKSDB_VERSION="6.7.3"
+ZSTD_VERSION="1.4.4"
 
 echo "This script configures CentOS with everything needed to build and run RocksDB"
 
@@ -40,5 +40,6 @@ cd /usr/local/rocksdb
 chown -R vagrant:vagrant /usr/local/rocksdb/
 sudo -u vagrant make static_lib
 cd examples/
-sudo -u vagrant make all
-sudo -u vagrant ./c_simple_example
+sudo -u vagrant LD_LIBRARY_PATH=/usr/local/lib/ make all
+sudo -u vagrant LD_LIBRARY_PATH=/usr/local/lib/ ./c_simple_example
+