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/role/role-member-hostgroup-present.yml

@@ -5,7 +5,8 @@
   gather_facts: no
 
   tasks:
-  - iparole:
+  - name: Ensure role member 'hostgroup' is present.
+    iparole:
       ipaadmin_password: SomeADMINpassword
       name: somerole
       hostgroup: