AMBARI-2961. NameNode HA Wizard: enable the wizard in the UI by default. (yusaku)

ambari-web/app/config.js

@@ -58,7 +58,7 @@ App.supports = {
   hue: false,
   ldapGroupMapping: false,
   localRepositories: false,
-  highAvailability: false
+  highAvailability: true
 };
 
 if (App.enableExperimental) {

ambari-web/app/messages.js

@@ -694,7 +694,7 @@ Em.I18n.translations = {
     '1. Put the NameNode in safe mode (read-only-mode) by running: <br/><br/>' +
     '$ hdfs dfsadmin -safemode enter <br/><br/>' +
     '2. Once NameNode is in Safe Mode, create a checkpoint by running: <br/><br/>' +
-    '$ TDB COMMAND <br/><br/>' +
+    '$ hdfs dfsadmin -saveNamespace <br/><br/>' +
     '3. You will be able to proceed to the next step once we detect that the NameNode is in Safe Mode and that the checkpoint has been created successfully.',
   'admin.highAvailability.wizard.step3.body':'Confirm your host selection and click Deploy to activate NameNode HA.',
   'admin.highAvailability.wizard.step2.body':'Select a host that will be running an additional NameNode.<br/> In addition,' +