AMBARI-15212 Master component names are missing on service summary page (Joe Wang via rzang)

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

@@ -462,6 +462,7 @@ App.UpdateController = Em.Controller.extend({
         'host_components/HostRoles/stale_configs,' +
         'host_components/HostRoles/ha_state,' +
         'host_components/HostRoles/desired_admin_state,' +
+        'host_components/HostRoles/display_name,' +
         conditionalFieldsString +
         '&minimal_response=true';
 

ambari-web/app/mappers/service_metrics_mapper.js

@@ -152,6 +152,7 @@ App.serviceMetricsMapper = App.QuickDataMapper.create({
     passive_state: 'HostRoles.maintenance_state',
     display_name: 'HostRoles.display_name',
     component_name: 'HostRoles.component_name',
+    display_name: 'HostRoles.display_name',
     host_id: 'HostRoles.host_name',
     host_name: 'HostRoles.host_name',
     stale_configs: 'HostRoles.stale_configs',