AMBARI-17004. Unit tests failing because of the order of hash sets/maps (Miklos Gergely via oleewere)

ambari-server/src/main/java/org/apache/ambari/server/audit/event/request/ViewPrivilegeChangeRequestAuditEvent.java

@@ -23,6 +23,8 @@ import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
+import java.util.SortedSet;
+import java.util.TreeSet;
 
 import javax.annotation.concurrent.Immutable;
 
@@ -89,7 +91,7 @@ public class ViewPrivilegeChangeRequestAuditEvent extends RequestAuditEvent {
         .append(name)
         .append(")");
 
-      Set<String> roleSet = new HashSet<String>();
+      SortedSet<String> roleSet = new TreeSet<String>();
       roleSet.addAll(users.keySet());
       roleSet.addAll(groups.keySet());