MXS-1300: Make the MaxCtrl core a Node.js module

The core is now a module that is loaded by the command line client. This
allows the core library to be reused for testing.

maxctrl/lib/link.js

@@ -1,49 +0,0 @@
-/*
- * 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')()
-
-function addServer(argv, path, targets) {
-    maxctrl(argv, function(host){
-        return doRequest(host, path, function(res) {
-            var servers =_.get(res, 'data.relationships.servers.data', [])
-
-            targets.forEach(function(i){
-                servers.push({id: i, type: 'servers'})
-            })
-
-            // Update relationships and remove unnecessary parts
-            _.set(res, 'data.relationships.servers.data', servers)
-            delete res.data.attributes
-
-            return doAsyncRequest(host, path, null, {method: 'PATCH', body: res})
-        })
-    })
-}
-
-exports.command = 'link <command>'
-exports.desc = 'Link objects'
-exports.handler = function() {}
-exports.builder = function(yargs) {
-    yargs
-        .command('service <name> <server...>', 'Link servers to a service', {}, function(argv) {
-            addServer(argv, 'services/' + argv.name, argv.server)
-        })
-        .command('monitor <name> <server...>', 'Link servers to a monitor', {}, function(argv) {
-            addServer(argv, 'monitors/' + argv.name, argv.server)
-        })
-        .usage('Usage: link <command>')
-        .help()
-        .command('*', 'the default command', {}, () => {
-            logger.log('Unknown command. See output of `help link` for a list of commands.')
-        })
-}