AMBARI-6558. FE allows add host on host that is in UNKNOWN state (agent was stopped).(xiwang)

ambari-web/app/controllers/wizard/step9_controller.js

@@ -1077,7 +1077,7 @@ App.WizardStep9Controller = Em.Controller.extend({
    */
   isAllComponentsInstalled: function () {
     var dfd = $.Deferred();
-    if (this.get('content.controllerName') !== 'installerController') {
+    if (this.get('content.controllerName') !== 'installerController' && this.get('content.controllerName') !== 'addHostController') {
       dfd.resolve();
     } else {
       App.ajax.send({