MXS-3013: Add reload service MaxCtrl command

The command currently reloads the users of a service but it can be used to
reload other parts of it as well (e.g. encryption keys).

maxctrl/lib/reload.js

@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2020 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: 2024-04-23
+ *
+ * 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')()
+
+exports.command = 'reload <command>'
+exports.desc = 'Reload objects'
+exports.handler = function() {}
+exports.builder = function(yargs) {
+    yargs
+        .command('service <service>', 'Reloads the database users of this service', function(yargs) {
+            return yargs.usage('Usage: reload service <service>')
+        }, function(argv) {
+            maxctrl(argv, function(host){
+                return doRequest(host, 'services/' + argv.service + '/reload', null, {method: 'POST'})
+            })
+        })
+        .usage('Usage: reload <command>')
+        .help()
+        .command('*', 'the default command', {}, function(argv) {
+            maxctrl(argv, function(host) {
+                return error('Unknown command. See output of `help reload` for a list of commands.')
+            })
+        })
+}