Exposing default variables in playbook

This will aloow openstack tripleo-validator run subcommand to override them
and they will be displayed in the show subcommand.

Change-Id: I6901792427ce3045841a31f8cc230c2f909a848f
(cherry picked from commit d9f9f4ecc0)
(cherry picked from commit 8110e42e33)

playbooks/overcloud-service-status.yaml

@@ -14,5 +14,12 @@
         - post-upgrade
         - post-overcloud-upgrade
         - post-overcloud-converge
+    overcloud_service_status_debug: false
+    overcloud_service_api:
+      - nova
+      - cinderv3
+    overcloud_deprecated_services:
+      nova:
+        - nova-consoleauth
   roles:
     - overcloud_service_status