use YAML output from ansible as it makes reading errors easier

Opinionated commit here that it's easier to read the YAML output on
failure then it is to read the giant single line JSON blob when a
failure happens.

ansible/playbooks/ansible.cfg

@@ -9,7 +9,10 @@ gathering = smart
 fact_caching = jsonfile
 fact_caching_connection = /tmp
 fact_caching_timeout = 86400
-stdout_callback = default
+# Use the YAML callback plugin because it's easier to read the errors
+stdout_callback = YAML
+# Use the stdout_callback when running ad-hoc commands.
+bin_ansible_callbacks = True
 display_skipped_hosts = no
 callbacks_enabled = profile_tasks
 deprecation_warnings = False