refactor: Fail2ban polling update and dropping of the FW checking (#7936)

* Update polling and drop the firewalled bit.

Since fail2ban on FreeBSD has moved to using anchors, the previous
issue of it dreking all over its self is no longer a problem.

And AFAIK it has never been an issue on Linux.

This also makes this script more cross platform as well instead.

* change the name of the graph of the total banned so people don't have to remove old file

* go back to the original RRD and just shove U into the no longer data area

html/includes/graphs/application/fail2ban_banned.inc.php

@@ -21,12 +21,6 @@ if (is_file($rrd_filename)) {
             'ds'       => 'banned',
             'colour'   => '582A72'
         ),
-        array(
-            'filename' => $rrd_filename,
-            'descr'    => 'Firewalled',
-            'ds'       => 'firewalled',
-            'colour'   => '28774F'
-        )
     );
 } else {
     echo "file missing: $rrd_filename";