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/vault/vault-is-present-with-public-key-file.yml

@@ -10,18 +10,21 @@
   gather_facts: True
 
   tasks:
-  - copy:
+  - name: Copy public key file to server.
+    copy:
       src: "{{ playbook_dir }}/public.pem"
       dest: "{{ ansible_facts['env'].HOME }}/public.pem"
       owner: "{{ ansible_user }}"
       group: "{{ ansible_user }}"
       mode: 0600
-  - ipavault:
+  - name: Ensure asymmetric vault exists with public key from file.
+    ipavault:
       ipaadmin_password: SomeADMINpassword
       name: asymvault
       username: admin
       vault_type: asymmetric
       vault_public_key_file: "{{ ansible_facts['env'].HOME }}/public.pem"
-  - file:
+  - name: Remove public key file from server.
+    file:
       path: "{{ ansible_facts['env'].HOME }}/public.pem"
       state: absent