Fix ansible-lint E502 for test playbooks.

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

tests/pytests/dnszone/playbooks/dnszone_name_from_ip.yaml

@@ -3,6 +3,7 @@
   hosts: ipaserver
 
   tasks:
-  - ipadnszone:
+  - name: Ensure a reverse DNS Zone with name inferred form an IP address
+    ipadnszone:
       ipaadmin_password: SomeADMINpassword
       name_from_ip: 192.8.2.0/22