Quoting fix for LocalTransport.list_dir

[David Allouche]

When trying to convert a Launchpad branch into metadir format, I hit a
bug caused by incorrect url quoting in LocalTransport (one of weaves has
a '/' in its id).

The attached patch fix LocalTransport.list_dir to allow converting
Launchpad to metadir. It should probably be augmented by a number of
test cases, and probably overlaps wildly with John's local transport
quoting branch. But I'm posting it here for the record.

Test suite passes.
-- 
                                                            -- ddaa
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