Added Config drive functionality

* Added config drive config
* Added config drive ec2 metadata model
* Added base config drive path and source path
* fixed PEP8 issue
* Rename after Daryl review
* Renamed cd to config drive and new file added
* Fixed John issues after review and added 2 config params
* Expand name from meta to metadata
* Renamed file to match the class name

Change-Id: Iefaf5a0cb543a13a22ebd9f129c56684a5d40540
Merge "Added Config drive functionality"