[MERGE] fixes for selftest on win32 (part 2)

[Alexander Belchenko]

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> I noticed your last commit message is "now all tests pass on win32". So
> figured I would do a full test run and verify that. (Of course, this
> takes a while, so I won't know just yet).

This comment is incorrect. It says about test_sftp_transport.py,
not about overall selftest suite. I apologize for this incidental false.

I'll change it to be more clear.

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