Fix ansible-lint error 502 (unnamed-task) for example playbooks.

This patch adds 'name' to all example playbook tasks that did not
have it, fixing ansible-lint's error 'unnamed-task'.

playbooks/config/retrieve-config.yml

@@ -10,5 +10,6 @@
       ipaadmin_password: SomeADMINpassword
     register: serverconfig
 
-  - debug:
+  - name: Display current configuration.
+    debug:
       msg: "{{ serverconfig }}"