SERVER-13635: fix test for kv that restarts engine
SERVER-14352: move rocks engine to kv interface
SERVER-13635: do not use collection names for file names in kv engine to avoid confusion
SERVER-13635: use new index command when checking shard keys
SERVER-13635: update many sharding tests to work with other storage engines
SERVER-13635: make bench test more reliable
SERVER-14352: turn off some lint options for rocks