Enable tripleo setup for molecule

We currently don't setup the tripleo repos for the tripleo_bootstrap
role so the required package installation is not picking up the correct
packages (e.g. puppet).

Change-Id: I351f7ce8b4a2d8187a0c63f9c804d2fe97486cf3
(cherry picked from commit 8765d31264)

tripleo_ansible/roles/tripleo_bootstrap/molecule/default/prepare.yml

@@ -17,5 +17,8 @@
 
 - name: Prepare
   hosts: all
-  roles:
-    - role: test_deps
+  tasks:
+    - include_role:
+        name: test_deps
+      vars:
+        test_deps_setup_tripleo: true