AMBARI-13263. Create a Ranger theme with Ranger Admin. (jaimin)

ambari-web/app/data/HDP2.2/site_properties.js

@@ -216,6 +216,13 @@ hdp22properties.push(
     "category": "RANGER_ADMIN",
     "index": 0
   },
+  {
+    "name": "ranger_admin_username",
+    "serviceName": "RANGER",
+    "filename": "ranger-env.xml",
+    "category": "RANGER_ADMIN",
+    "index": 0
+  },
   {
     "name": "ranger_admin_password",
     "serviceName": "RANGER",