Basic HWGroup Poseidon Discovery

Initial PR

includes/discovery/os/poseidon.inc.php

@@ -0,0 +1,17 @@
+<?php
+/*
+ * LibreNMS
+ *
+ * Copyright (c) 2016 Søren Friis Rosiak <sorenrosiak@gmail.com> 
+ * 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 (!$os) {
+    if (strstr($sysObjectId, '.1.3.6.1.4.1.21796.3.3')) {
+        $os = 'poseidon';
+    }
+}