AMBARI-13098. Button "Retry" should be blocked after click on step6 AHW (onechiporenko)

ambari-web/app/controllers/main/host/add_controller.js

@@ -406,6 +406,7 @@ App.AddHostController = App.WizardController.extend({
   installServices: function (isRetry, callback, errorCallback) {
     callback = callback || Em.K;
     this.set('content.cluster.oldRequestsId', []);
+    this.set('content.cluster.status', 'PENDING');
     var clusterName = this.get('content.cluster.name');
     var hostNames = [];
     var hosts = this.getDBProperty('hosts');