Remplacement de certains with_* par loop.

Sauf le `with_fileglob`, conformément aux recommendations de la
documentation Ansible :

    https://docs.ansible.com/ansible/latest/user_guide/playbooks_loops.html

roles/logstash/tasks/main.yml

@@ -33,7 +33,7 @@
     owner: logstash
     group: logstash
     mode: u=r,g=,o=
-  with_items:
+  loop:
     - main.conf
     - sshd.conf
     - pam_unix.conf

roles/openssl-ca/tasks/main.yml

@@ -7,7 +7,7 @@
     owner: root
     group: root
     mode: "{{ item.mode }}"
-  with_items:
+  loop:
     - name: ssl
       mode: u=rwx,g=rx,o=rx
     - name: ssl/private