Gennadii Natin

> This is due to the [`KernelManager.cache_ports` value of `True`](https://github.com/jupyter/jupyter_client/blob/e7ebada6044f4b269b120e561bdba0cef5587a68/jupyter_client/provisioning/local_provisioner.py#L181) (which is the trait's default for `transport == tcp`). Unfortunately, [this trait is not marked as configurable](https://github.com/jupyter/jupyter_client/blob/e7ebada6044f4b269b120e561bdba0cef5587a68/jupyter_client/manager.py#L185), so I'm not...