public Properties getLogConfig(final String topic) {
        return brokers[0].kafkaServer().zkClient().getEntityConfigs(ConfigType.TOPIC, topic);
    }
Deletes all topics and blocks until all topics got deleted.

@param timeoutMs the max time to wait for the topics to be deleted (does not block if {@code <= 0})
streams/src/test/java/org/apache/kafka/streams/integration/utils/EmbeddedKafkaCluster.java