Major Description
As part of KAFKA-2211 (https://github.com/apache/kafka/pull/195/files) we introduced a reusable ZkNodeChangeNotificationListener to ensure node changes can be processed in a loss less way. This was pretty much the same code in DynamicConfigManager with little bit of refactoring so it can be reused. We now need to make DynamicConfigManager itself to use this new class once KAFKA-2211 is committed to avoid code duplication.