MXS-1300: Add set and clear commands

The manipulation of server status is now possible with the set and clear
commands.

client/maxctrl/lib/clear.js

@@ -0,0 +1,28 @@
+/*
+ * 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')()
+
+exports.command = 'clear <command>'
+exports.desc = 'Clear object status'
+exports.handler = function() {}
+exports.builder = function(yargs) {
+    yargs
+        .command('server <server> <status>', 'Clear server status', {}, function(argv) {
+            var target = 'servers/' + argv.server + "/clear?status=" + argv.status
+            doRequest(target, null, {method: "POST"})
+        })
+        .command('*', 'the default command', {}, () => {
+            console.log("Unknown command. See output of 'help clear' for a list of commands.")
+        })
+        .help()
+}