[PATH] Fix list_dir quoting in SFTPTransport and FTPTransport

[David Allouche]

While attempting to convert a branch producted by baz-import to knits, I
ran into a bug of SFTPTransport.list_dir, it did not urlquote its return
value.

That actually caused Transport.copy_tree to throw an error, and there
was a ill-conceived "fix" in iter_files_recursive to work around the
list_dir bug, so I extended test_list_dir and test_iter_files_recursive
to check for proper quoting. I also added a test_copy_tree because
that's ultimately the functionality I needed.

Robert Collins told me that a fix for the same problem was recently
reviewed, but I though my patch might also be of interest, in particular
with respect to its test changes.

Please CC me in replies to this message.
-- 
                                                            -- ddaa
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