Separate classes for event listener and client info

Separate classes for event listener and client info

Modified the csensor_event_listener and separated the client information into a separate class. Earlier both the client information and the event listener functionality was present in a single class.
This is more structured code.

Review: Removing the functions from event_listener class as they have been moved to client_info class.
Review2: Removing m_client_info from csensor_event_listener and using it as a static instance.

Change-Id: Ie18e84023a8c448fbd8a06f2d2615b4e8c117c65