Also restart turn server on dashboard domain change

src/cloudron.js

@@ -21,7 +21,8 @@ exports = module.exports = {
     runSystemChecks: runSystemChecks,
 };
 
-var apps = require('./apps.js'),
+var addons = require('./addons.js'),
+    apps = require('./apps.js'),
     appstore = require('./appstore.js'),
     assert = require('assert'),
     async = require('async'),
@@ -326,6 +327,7 @@ function setDashboardAndMailDomain(domain, auditSource, callback) {
         if (error) return callback(error);
 
         mail.onMailFqdnChanged(NOOP_CALLBACK); // this will update dns and re-configure mail server
+        addons.restartService('turn', NOOP_CALLBACK); // to update the realm variable
 
         callback(null);
     });