directoryServer: move out start/stop from cron

src/cron.js

@@ -25,7 +25,6 @@ const appHealthMonitor = require('./apphealthmonitor.js'),
     constants = require('./constants.js'),
     CronJob = require('cron').CronJob,
     debug = require('debug')('box:cron'),
-    directoryServer = require('./directoryserver.js'),
     dyndns = require('./dyndns.js'),
     eventlog = require('./eventlog.js'),
     janitor = require('./janitor.js'),
@@ -174,10 +173,6 @@ async function handleSettingsChanged(key, value) {
         await stopJobs();
         await startJobs();
         break;
-    case settings.DIRECTORY_SERVER_KEY:
-        if (value.enabled) await directoryServer.start();
-        else await directoryServer.stop();
-        break;
     default:
         break;
     }