return the rebalancing limit as well as the movements for lpt rebalancing

xtreemfs_client/dataDistribution.py

@@ -271,7 +271,7 @@ class DataDistribution(object):
         for folder_id, target in new_assignments:
             movements[folder_id] = (movements[folder_id], target)
 
-        return movements
+        return movements, reassignment_limit
 
     def rebalance_one_folder(self):
         """