Only ban in response to fail2ban results

Don't mail them individually to the destemail. The destemail setting is thus no
longer used, but let's set it anyway to be clear where it will mail if you
change the action back.

roles/common/templates/etc_fail2ban_jail.local.j2

 bantime   = 86400
 destemail = {{ admin_email }}
 banaction = iptables-multiport
-action    = %(action_mwl)s
+action    = %(action_)s
 
 # JAILS
 [ssh]