Code review comment for lp:~parthm/bzr/262450

This fails in pqm in a blackbox.test_upgrade test because of a clash with the change of backup directory name:

Traceback (most recent call last):
 File "/usr/lib/python2.4/site-packages/testtools/runtest.py", line 128, in _run_user
   return fn(*args)
 File "/usr/lib/python2.4/site-packages/testtools/testcase.py", line 368, in _run_test_method
   testMethod()
 File "/home/pqm/bzr-pqm-workdir/home/+trunk/bzrlib/tests/blackbox/test_upgrade.py", line 160, in test_upgrade_permission_check
   new_perms = os.stat(backup_dir).st_mode & 0777
OSError: [Errno 2] No such file or directory: 'backup.bzr'
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