The definition for the Spring Integration Zookeeper leader listener
'org.springframework.integration.zookeeper.leader.LeaderInitiator'
to automatically start/stop endpoints based on the Role.
The 'role' attribute here is matched to 'role' attributes on associated 'SmartLifecycle'
beans.
Endpoint roles can be defined in XML configuration or via '@Role' annotations.
A reference to a CuratorFramework bean.
The path in zookeeper.