Cleanup property-related variable names
Cleanup property-related variable names

Summary:
I noticed these names were quite confusing while updating GetProperty
documentation.

Test Plan: running "make commit-prereq -j32"

Reviewers: yhchiang, sdong

Reviewed By: sdong

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D53073

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