High: ganesha: Introducing ganesha agent for managing nfs in user space

This agent isn't ready to be merged. I am posting this here for review and to advertise that the agent is under development.

This scenario file describes how to deploy this agent to export a gluster volume.
https://github.com/davidvossel/phd/blob/master/scenarios/ganesha-gluster.scenario

I am testing with fedora 20