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/dnsrecord/ensure-dnsrecord-with-reverse-is-present.yml

@@ -1,12 +1,12 @@
 ---
-- name: Test DNS Record is present.
+- name: Playbook to manage DNS records.
   hosts: ipaserver
   become: true
   gather_facts: false
 
   tasks:
-  # Ensure that dns record is present
-  - ipadnsrecord:
+  - name: Ensure that dns record is present
+    ipadnsrecord:
       ipaadmin_password: SomeADMINpassword
       name: host01
       zone_name: example.com