Revert "Add cpu usage to regression benchmarks (3rd attempt)"
Revert "Add cpu usage to regression benchmarks (3rd attempt)"

Summary:
This reverts commit 476e80be80903158ac0af486aad630efff70b036.
Closes https://github.com/facebook/rocksdb/pull/2177

Differential Revision: D4914830

Pulled By: maysamyabandeh

fbshipit-source-id: 039299348ceb325aa721eb35e3a26e890f84ee74

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