Refactor to support changes made in engine config overhaul

* Updated all files to reflect changes in engine configuration overhaul.
* Cleaned up post-install processes and improved post-install reporting
  of where configs are being copied to.
* Moved ConfigSectionInterface class to opencafe

Change-Id: If0ddf88563c3ff7cf9971221e19b5f4666db295f
Merge "Refactor to support changes made in engine config overhaul"