Fix ColumnFamilyTest:BulkAddDrop
Fix ColumnFamilyTest:BulkAddDrop

Summary:
Fix ColumnFamilyTest:BulkAddDrop not deleted CF handles at the end, causing ASAN failure.
Closes https://github.com/facebook/rocksdb/pull/2275

Differential Revision: D5040724

Pulled By: yiwu-arbug

fbshipit-source-id: 86cd4070c944d01173a3cc36462bb800698af192

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