AMBARI-15909. Alert help_url is not visible on the dash board (onechiporenko)

ambari-web/app/controllers/global/update_controller.js

@@ -546,7 +546,7 @@ App.UpdateController = Em.Controller.extend({
     var realUrl = '/alert_definitions?fields=' +
       'AlertDefinition/component_name,AlertDefinition/description,AlertDefinition/enabled,AlertDefinition/repeat_tolerance,AlertDefinition/repeat_tolerance_enabled,' +
       'AlertDefinition/id,AlertDefinition/ignore_host,AlertDefinition/interval,AlertDefinition/label,AlertDefinition/name,' +
-      'AlertDefinition/scope,AlertDefinition/service_name,AlertDefinition/source';
+      'AlertDefinition/scope,AlertDefinition/service_name,AlertDefinition/source,AlertDefinition/help_url';
     var url = this.getUrl(testUrl, realUrl);
 
     App.HttpClient.get(url, App.alertDefinitionsMapper, {

ambari-web/app/mappers/alert_definitions_mapper.js

@@ -39,7 +39,7 @@ App.alertDefinitionsMapper = App.QuickDataMapper.create({
     repeat_tolerance: 'AlertDefinition.repeat_tolerance',
     scope: 'AlertDefinition.scope',
     interval: 'AlertDefinition.interval',
-    helpUrl: 'AlertDefinition.help_url',
+    help_url: 'AlertDefinition.help_url',
     type: 'AlertDefinition.source.type',
     reporting_key: 'reporting',
     reporting_type: 'array',

ambari-web/test/mappers/alert_definitions_mapper_test.js

@@ -198,7 +198,7 @@ describe('App.alertDefinitionsMapper', function () {
             "component_name" : "NAMENODE",
             "description" : "This service-level alert is triggered if the NN heap usage deviation has grown beyond the specified threshold within a given time interval.",
             "enabled" : true,
-            "help_url" : null,
+            "help_url" : "http://test.test",
             "id" : 6,
             "ignore_host" : false,
             "interval" : 1,
@@ -504,6 +504,7 @@ describe('App.alertDefinitionsMapper', function () {
           "scope" : "SERVICE",
           "service_name" : "HDFS",
           "component_name" : "NAMENODE",
+          "help_url" : "http://test.test"
         }
       ];