knot: use perlpod documentation format

plugins/knot/knot

@@ -1,21 +1,38 @@
-#!/usr/bin/python3 -tt
-# -*- coding: utf-8 -*-
+#!/usr/bin/env python3
 # pylint: disable=invalid-name
 # pylint: enable=invalid-name
 
 """Munin plugin to monitor Knot DNS server.
 
-Copyright 2017, Kim B. Heino, b@bbbs.net, Foobar Oy
-License GPLv2+
+=head1 NAME
 
-This plugin requires Munin config /etc/munin/plugin-conf.d/knot:
+knot - monitor Knot DNS server statistics
 
-[knot]
-user root
+=head1 APPLICABLE SYSTEMS
 
+Systems with Knot DNS server installed.
 
-#%# capabilities=autoconf
-#%# family=auto
+=head1 CONFIGURATION
+
+This plugin requires config:
+
+    [knot]
+    user root
+
+=head1 AUTHOR
+
+Kim B. Heino <b@bbbs.net>
+
+=head1 LICENSE
+
+GPLv2
+
+=head1 MAGIC MARKERS
+
+ #%# family=auto
+ #%# capabilities=autoconf
+
+=cut
 """
 
 import os
@@ -175,7 +192,7 @@ def main(args):
     """Do it all main program."""
     values = get_stats()
     if len(args) > 1 and args[1] == 'autoconf':
-        print('yes' if values else 'no')
+        print('yes' if values else 'no (knot is not running)')
     elif len(args) > 1 and args[1] == 'config':
         print_config(values)
     else: