Removed the system.out.println.

voter-registry/src/main/java/meerkat/registry/AsyncRegistryCallbacks/GetGroupsCallback.java

@@ -55,7 +55,6 @@ public class GetGroupsCallback implements FutureCallback<List<BulletinBoardMessa
 
     @Override
     public void onFailure(Throwable t) {
-        System.out.println(t);
         this.callback.onFailure(t);
     }
 }