removing .id as the folder map's keys already are folder ids

xtreemfs_client/OSDManager.py

@@ -680,8 +680,8 @@ class OSDManager(object):
     def get_containing_folder_id(self, path_on_volume):
         for osd in self.distribution.OSDs.values():
             for a_folder in osd.folders:
-                if path_on_volume.startswith(a_folder.id):
-                    return a_folder.id
+                if path_on_volume.startswith(a_folder):
+                    return a_folder
         return None
 
     def __str__(self):