[FIX] hw_scale: remove useless python module

bzr revid: fva@openerp.com-20140425123246-lexb4viqi6k7zwgq

addons/hw_scale/controllers/main.py

@@ -7,7 +7,6 @@ from os.path import join
 from threading import Thread, Lock
 from select import select
 from Queue import Queue, Empty
-from bitstring import BitArray
 
 import openerp
 import openerp.addons.hw_proxy.controllers.main as hw_proxy