Merge branch 'fail2ban' into 'master'

Updating the handlers with systemd module & make a copy before deploy

See merge request hpc-team/ansible_cluster_in_a_box!258

Former-commit-id: d1c997f5

roles/fail2ban/handlers/main.yml

 ---
 - name: restart fail2ban
-  service: name=fail2ban state=restarted
+  systemd:
+    name: fail2ban
+    enabled: yes
+    state: restarted
+  become: true
+  become_user: root

roles/fail2ban/tasks/main.yml

@@ -3,7 +3,6 @@
   yum:
     name: 
     - fail2ban-server
-    - fail2ban-systemd
     - fail2ban-sendmail
     state: present
   become: true
@@ -14,6 +13,7 @@
   template:
     src: jail.conf.j2
     dest: /etc/fail2ban/jail.conf
+    backup: yes
     mode: 0644
     owner: root
     group: root