Centralize testing preparation

Adding dependencies and default vars in order to use
bifrost-prepare-for-test as the main role to prepare
for testing.

roles/bifrost-prepare-for-test/meta/main.yml

@@ -113,4 +113,10 @@ galaxy_info:
   #- packaging
   #- system
   #- web
-dependencies: []
+dependencies:
+- bifrost-create-vm-nodes
+- ironic-install
+- ironic-enroll
+- bifrost-validate-host-for-deploy
+- bifrost-configdrives
+- bifrost-setup-nodes

roles/bifrost-prepare-for-test/vars/main.yml

@@ -1,2 +1,4 @@
 ---
-# vars file for bifrost-prepare-for-test
+cleaning: false
+testing: true
+baremetal_csv_file: "/tmp/baremetal.csv"