Test defaults honors project variables

The defaults can make use of variables passed by the project and I am
taking advantage of that feature in my templates.

With 70ed2236 / https://review.openstack.org/#/c/85336/ there is a
regression which cause the test to fail although it pass with parent
commit d833015.

Change-Id: I57d023657eec4f6f8f29980100185fcfd7e77b1f
Merge "Test defaults honors project variables"