opendns - add xmlrpc sync hook

src/etc/inc/plugins.inc.d/opendns.inc

@@ -49,6 +49,16 @@ function opendns_configure_do($verbose = false)
     }
 }
 
+function opendns_xmlrpc_sync()
+{
+    return [
+        [
+            'description' => gettext('OpenDNS'),
+            'section' => 'opendns',
+            'id' => 'opendns'
+        ]
+    ];
+}
 function opendns_register($pconfig)
 {
     $ch = curl_init();