AMBARI-9903. core-site.xml having wrong value for hadoop.proxyuser.HTTP.groups (rlevas)

ambari-server/src/main/resources/common-services/HDFS/2.1.0.2.0/kerberos.json

@@ -39,7 +39,7 @@
             "hadoop.http.authentication.token.validity": "",
             "hadoop.http.authentication.cookie.domain": "",
             "hadoop.http.authentication.cookie.path": "",
-            "hadoop.proxyuser.HTTP.groups": "${core-site/proxyuser_group}"
+            "hadoop.proxyuser.HTTP.groups": "${hadoop-env/proxyuser_group}"
           }
         }
       ],