Changes to fail2ban config should restart the fail2ban service

[acozine]

Expected behavior

When we push a change to our fail2ban configuration, the change should kick off ("notify" in Ansible terminology) a handler to restart the service.

Actual behavior

When we push a change to our fail2ban configuration, the task that restarts the handler does not run.

Steps to replicate

Change the fail2ban configuration in the nginxplus role, run the playbook to update it.

Impact of this bug

Changes to fail2ban configuration are not immediately applied.

Relevant links and code snippets, if applicable

We do have a restart fail2ban handler.
However, in the install-prerequisites.yml file, only one task notifies that handler.
Documentation about Ansible handlers.

Implementation notes, if any

Add notify: restart fail2ban to any task in install-prerequisites.yml that should run the handler to force a restart of the fail2ban service.