Agent hierarchy
***************

Service name	[unique name]
Interface name	org.moblin.connman.Agent
Object path	[random object]

Methods		void Release()


Method: Release
===============
This method will be called when the core releases the agent. This normally
happens when the core shuts down.

To get notified when the core exits, an agent should also watch out for the
NameOwnerChanged from org.moblin.connman service.