protected Properties createProducerConfigs() {
    Properties producerProps = new Properties();
    producerProps.setProperty(CommonClientConfigs.BOOTSTRAP_SERVERS_CONFIG, bootstrapServers());
    producerProps.setProperty(CommonClientConfigs.RETRIES_CONFIG, String.valueOf(Integer.MAX_VALUE));
    producerProps.setProperty(KEY_SERIALIZER_CLASS_CONFIG, STRING_SERIALIZER);
    producerProps.setProperty(VALUE_SERIALIZER_CLASS_CONFIG, BYTE_ARRAY_SERIALIZER);
    return producerProps;
  }
Overrides of the method should provide the following configurations
 1. boostrap.servers
 2. key.serializer
 3. value.serializer

@return {@link Properties} for the test kafka producer
samza-test/src/test/java/org/apache/samza/test/harness/IntegrationTestHarness.java