Added PowerWalker detection

includes/definitions.inc.php

@@ -949,6 +949,11 @@ $config['os'][$os]['text'] = 'Liebert';
 $config['os'][$os]['type'] = 'power';
 $config['os'][$os]['icon'] = 'liebert';
 
+$os = 'powerwalker';
+$config['os'][$os]['text'] = 'PowerWalker UPS';
+$config['os'][$os]['type'] = 'power';
+$config['os'][$os]['icon'] = 'powerwalker';
+
 $os = 'engenius';
 $config['os'][$os]['type']             = 'wireless';
 $config['os'][$os]['text']             = 'EnGenius Access Point';

includes/discovery/os/powerwalker.inc.php

@@ -0,0 +1,16 @@
+<?php
+/*
+ * LibreNMS
+ *
+ * Copyright (c) 2016 Neil Lathwood <neil@lathwood.co.uk>
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation, either version 3 of the License, or (at your
+ * option) any later version.  Please see LICENSE.txt at the top level of
+ * the source code distribution for details.
+ */
+if (!$os) {
+    if (strpos($sysObjectId, '.1.3.6.1.4.1.935.10') !== false && $sysDescr == 'Network Management Card for UPS') {
+        $os = 'powerwalker';
+    }
+}