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

this fails with

^^^^[log from bzrlib.tests.per_transport.TransportTests.test_copy_tree(FTPTestServer)]
----------------------------------------------------------------------
Traceback (most recent call last):
 File "/home/pqm/bzr-pqm-workdir/home/2.0/bzrlib/tests/per_transport.py", line 1442, in test_copy_tree
   transport.copy_tree('from', 'to')
 File "/home/pqm/bzr-pqm-workdir/home/2.0/bzrlib/transport/__init__.py", line 1063, in copy_tree
   source.copy_tree_to_transport(target)
 File "/home/pqm/bzr-pqm-workdir/home/2.0/bzrlib/transport/__init__.py", line 1077, in copy_tree_to_transport
   to_transport.mkdir(dir)
 File "/home/pqm/bzr-pqm-workdir/home/2.0/bzrlib/transport/ftp/__init__.py", line 362, in mkdir
   unknown_exc=errors.FileExists)
 File "/home/pqm/bzr-pqm-workdir/home/2.0/bzrlib/transport/ftp/__init__.py", line 200, in _translate_perm_error
   raise unknown_exc(path, extra=extra)
FileExists: File exists: '/to/dir': 550 error creating directory: Permission denied

Parth, let me know if you want help with it.