[MERGE] Isolate the test HTTPServer from chdir calls

[John Arbash Meinel]

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Ian Clatworthy wrote:
| This is the first in a series of patches required to land
| Robert's stacked branches work into bzr.dev. Robert put an
| earlier version of this up for review in late Feb. Aaron
| had some comments and it was approved but not merged. See
| https://lists.ubuntu.com/archives/bazaar/2008q1/037910.html.
|
| I've since made some changes to fix a unicode test failure.
| Basically, that meant that the Win32 code and general code
| differences were removed altogether.
|
| I've also made some tweaks based on Aaron's feedback to the
| initial patch. I'm sure it could be further improved, though
| like Robert, I'm hesitant to do more than the minimum here
| right now.
|
| Ian C.
|

BB:approve

John
=:->

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