Remainder of renaming changes from savanna to sahara

* .gitignore change for testing config file
* base directory for openstack-common.conf
* change to default test config

Partial-Implements:  blueprint savanna-renaming-dashboard

Change-Id: I39310e2f767ce870752dc15106ac9f06a44dd859
Merge "Remainder of renaming changes from savanna to sahara"