[Sprint: 40] XD-2471,72,73: Add support for concurrency, compression, acks. Use defaults

Also, actually use beans created by S-I-kafka for configuration, thus removing duplicated code.
As far as I can tell from kafka-message-bus.xml and KafkaMessageBus, the default properties for requiredAcks and compressionCodec (immediately below) are not used in kafka-message-bus.xml (and in fact have no setters in KafkaMessageBus) - I believe that to be an oversight.