Dantherm hostname (#14223)

* Support for configured hostname to override sysName

* Update and add test data

---------

Co-authored-by: Tony Murray <murraytony@gmail.com>

LibreNMS/OS/DanthermOs.php

@@ -0,0 +1,34 @@
+<?php
+/**
+ * DanthermOs.php
+ *
+ * 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.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ * @link       https://www.librenms.org
+ */
+
+namespace LibreNMS\OS;
+
+use App\Models\Device;
+use LibreNMS\Interfaces\Discovery\OSDiscovery;
+
+class DanthermOs extends \LibreNMS\OS implements OSDiscovery
+{
+    public function discoverOS(Device $device): void
+    {
+        parent::discoverOS($device); // yaml
+
+        $device->sysName = \SnmpQuery::get('DANTHERM-COOLING-MIB::hostName.0')->value() ?: $device->sysName;
+    }
+}