OF-205: Fix issue with cluster task distribution when running >2 cluster members

git-svn-id: http://svn.igniterealtime.org/svn/repos/openfire/trunk@13350 b35dd754-fafc-0310-a699-88a17e54d16e

src/plugins/hazelcast/src/java/com/jivesoftware/util/cache/ClusteredCacheFactory.java

@@ -28,7 +28,6 @@ import java.util.HashSet;
 import java.util.Iterator;
 import java.util.Map;
 import java.util.Set;
-import java.util.TreeSet;
 import java.util.concurrent.Callable;
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.TimeoutException;
@@ -220,7 +219,7 @@ public class ClusteredCacheFactory implements CacheFactoryStrategy {
      * task, as the task is run asynchronously across the cluster.
      */
     public void doClusterTask(final ClusterTask task) {
-        Set<Member> members = new TreeSet<Member>();
+        Set<Member> members = new HashSet<Member>();
         Member current = cluster.getLocalMember();
         for(Member member : cluster.getMembers()) {
         	if (!member.getUuid().equals(current.getUuid())) {