Comment 4 for bug 951197

Right now, update.py is not usable.
whitepearl:openstack-common bhuvan$ python update.py ../nova/openstack-common.conf
Traceback (most recent call last):
  File "update.py", line 74, in <module>
    if f is not None:
NameError: name 'f' is not defined

With Johannes's patch in #3, it's working fine.

Johannes, can you please propose your patch for review, as attached in gerrit?