MXS-1300: Add initial implementation of MaxCtrl

This is the administrative client that uses the REST API to communicate
with MaxScale. It is written in Node.js as it can handle the JSON format
data returned by the REST API natively. Currently only list and show
functionality is implemented.

client/maxctrl/maxctrl.js

@@ -0,0 +1,21 @@
+/*
+ * Copyright (c) 2016 MariaDB Corporation Ab
+ *
+ * Use of this software is governed by the Business Source License included
+ * in the LICENSE.TXT file and at www.mariadb.com/bsl11.
+ *
+ * Change Date: 2020-01-01
+ *
+ * On the date above, in accordance with the Business Source License, use
+ * of this software will be governed by version 2 or later of the General
+ * Public License.
+ */
+require('./common.js')()
+
+'use strict';
+
+program
+    .command(require('./lib/list.js'))
+    .command(require('./lib/show.js'))
+    .demandCommand(1, 'At least one command is required')
+    .argv