Description of problem:
In bug 981180 I see the following error in fedup.log:

[     0.132] (II) fedup:<module>() Exception:
Traceback (most recent call last):
  File "/usr/bin/fedup-cli", line 181, in <module>
    main(args)
  File "/usr/bin/fedup-cli", line 82, in main
    do_cleanup(args)
  File "/usr/lib/python2.7/site-packages/fedup/commandline.py", line 183, in do_cleanup
    remove_cache()
  File "/usr/lib/python2.7/site-packages/fedup/sysprep.py", line 195, in remove_cache
    rm_rf(d)
  File "/usr/lib/python2.7/site-packages/fedup/util.py", line 51, in rm_rf
    rm_f(d, rm=rmtree)
  File "/usr/lib/python2.7/site-packages/fedup/util.py", line 48, in rm_f
    log.warn("failed to remove %s: %s", f, str(e))
NameError: global name 'log' is not defined