* cleanup constructors * remove persistent_param * remove test_persist_params_put_and_get old-commit-hash: 3b752a307f167ad536eb53cceac76f7034f2faf9
* cleanup constructors * remove persistent_param * remove test_persist_params_put_and_get old-commit-hash: 3b752a307f167ad536eb53cceac76f7034f2faf9