supplied url is altered by patch

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Robert Collins wrote:
> Public bug reported:
>
> 14:46 < lifeless> :!bzr patch http://paste.ubuntu.com/22781/plain/
> 14:46 < lifeless> bzr: ERROR: http://paste.ubuntu.com/22781/plain is
> permanently redirected to http://paste.ubuntu.com/22781/plain/
>
> Note that the given url - .../ is requested as ..., and that gets the
> redirect because the site wants it to be at .../.

There are many bzr bugs here:

1. The transport UI doesn't provide a direct way to retrieve a URL; one
must open the base url and then request a file.

2. urlutils.split does not preserve trailing slashes. So splitting
http://paste.ubuntu.com/22781/plain/ produces
('http://paste.ubuntu.com/22781', 'plain')

3. The transport API does not preserve trailing slashes:
>>> get_transport('http://paste.ubuntu.com/22781/plain/').get('').read()
bzrlib.errors.RedirectRequested: http://paste.ubuntu.com/22781/plain is
permanently redirected to http://paste.ubuntu.com/22781/plain/
>>> get_transport('http://paste.ubuntu.com/22781/').get('plain/').read()
bzrlib.errors.RedirectRequested: http://paste.ubuntu.com/22781/plain is
permanently redirected to http://paste.ubuntu.com/22781/plain/

Aaron
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