[MERGE] Refactor bzrlib.osutils._walkdirs_utf8 to aid API migration in future.

[John Arbash Meinel]

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Robert Collins wrote:
> This patch refactors the guts of _walkdirs_utf8 to be more modular. 
> 
> In my testing its no slower than trunk (3ms, the expected overhead of a
> call-per-dir on mozilla trees is below noise level). I believe my
> changes to the win32 walker are correct - that is that the win32 feature
> tests will pass and it will run well on win32; I would appreciate a
> win32 developer (two are cc'd to this) confirming that this is the case
> before I submit it to PQM [assuming it gets through review].
> 
> Cheers,
> Rob
> 

Just a quick note, the test__walkdirs_win32.py tests are broken at the
moment. With this patch. Probably easy to fix, and I'll give it a shot.

John
=:->

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