Function test_raftstore::create_test_engine

pub fn create_test_engine(
    router: Option<RaftRouter<RocksEngine, RocksEngine>>, 
    limiter: Option<Arc<IORateLimiter>>, 
    cfg: &TiKvConfig
) -> (Engines<RocksEngine, RocksEngine>, Option<Arc<DataKeyManager>>, TempDir)