Fixed a crash bug that incorrectly parse deprecated options in options_helper
Fixed a crash bug that incorrectly parse deprecated options in options_helper

Summary: Fixed a crash bug that incorrectly parse deprecated options in options_helper

Test Plan:
run db_bench with an old options file with memtable_prefix_bloom_probes
./db_bench --options_file=AN_OLD_OPTIONS_FILE --num=100 --benchmarks=fillseq

Reviewers: sdong, IslamAbdelRahman

Subscribers: andrewkr, dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D59787

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