AMBARI-4985. Yarn Service check API returns with server-side exception in secure cluster. (swagle)

ambari-server/src/main/java/org/apache/ambari/server/Role.java

@@ -102,7 +102,7 @@ public class Role {
   public static final Role ZOOKEEPER_SERVER = valueOf("ZOOKEEPER_SERVER");
   public static final Role FALCON_SERVICE_CHECK = valueOf("FALCON_SERVICE_CHECK");
   public static final Role STORM_SERVICE_CHECK = valueOf("STORM_SERVICE_CHECK");
-  
+  public static final Role YARN_CLIENT = valueOf("YARN_CLIENT");
 
   private String name = null;
   

ambari-server/src/main/java/org/apache/ambari/server/metadata/ActionMetadata.java

@@ -59,6 +59,7 @@ public class ActionMetadata {
     serviceClients.put("oozie"      , Role.OOZIE_CLIENT.toString());
     serviceClients.put("pig"        , Role.PIG.toString());
     serviceClients.put("sqoop"      , Role.SQOOP.toString());
+    serviceClients.put("yarn"       , Role.YARN_CLIENT.toString());
   }
 
   private void fillServiceActions() {