poll never stops with incorrect password for SCRAM-SHA-256

When using SCRAM-SHA-256 and the password is incorrect, then poll hangs ignoring provided timeouts.

A ConnectionError exception raised at https://github.com/dpkp/kafka-python/blame/master/kafka/conn.py#L692 and retried for an infinite time at  https://github.com/dpkp/kafka-python/blob/master/kafka/client_async.py#L575