Change output format to yaml

ansible.cfg

@@ -5,6 +5,10 @@ nocows          = 1
 remote_user     = root
 roles_path      = ./roles
 vault_password_file = ./.vault_pass
+# Use the YAML callback plugin.
+stdout_callback = yaml
+# Use the stdout_callback when running ad-hoc commands.
+bin_ansible_callbacks = True
 
 [ssh_connection]
 pipelining      = true