[certbot] No change when certificates are already renewed

Signed-off-by: Yohann D'ANELLO <ynerant@crans.org>

roles/certbot/tasks/main.yml

@@ -45,6 +45,8 @@
 
 - name: Run certbot
   command: certbot --non-interactive --config /etc/letsencrypt/conf.d/{{ item.certname }}.ini certonly
+  register: certbot_output
+  changed_when: not "Certificate not yet due for renewal" in certbot_output.stdout
   loop: "{{ certbot }}"
 
 - name: Clean old files