@Override
        public void initialize(Subject subject, CallbackHandler callbackHandler, Map<String, ?> sharedState, Map<String, ?> options) {
            this.subject = subject;
        }
Verify that unparsed broker configs don't break clients. This is to ensure that clients
created by brokers are not broken if broker configs are passed to clients.
clients/src/test/java/org/apache/kafka/common/network/SaslChannelBuilderTest.java