Zuul: add file extension to playbook path

Zuul now supports including the file extension on the playbook path
and omitting the extension is now deprecrated.  Update references
to include the extension.

Change-Id: I888edf46f6f3a3ada068684162fcad382a019393

zuul.d/jobs.yaml

@@ -20,7 +20,7 @@
       Run functional tests for an OpenStack-Ansible project.
       Uses the gate-check-commit.sh script, running a default
       aio deploy.
-    run: zuul.d/playbooks/run
+    run: zuul.d/playbooks/run.yml
     timeout: 7200
     irrelevant-files:
       - ^\.git.*
@@ -158,4 +158,4 @@
       - master
     vars:
       action: upgrade
-      scenario: aio
+      scenario: aio