Nova.conf and Metadata-agent file consistency updates

This PR resolves #79 while also cleaning up the nova.conf template 
file as well as the metadata-agent.ini file.

* removed unused variables
* commented everything and added port / caching as explicite settings
* removed whitespace
* File clean up

Commented everything as sections in the file. Added +metadata_host and +metadata_port.
to the ``nova.conf`` file.