Update the module for new config file method

Since we have now an only config file (heat.conf) with this patch:
https://review.openstack.org/#/c/36476/

This patch updates the module and delete old configuration files
support and add a test.

Also, I fixed some tab issues in manifests.
Fix bug #1207858

Change-Id: If3d044e2581156fa5ce4de19f5c740328efa0aa8
Merge "Update the module for new config file method"