[issue27829] test.regrtest: changed environment variables are not logged

[STINNER Victor]

STINNER Victor added the comment:

> I tried random changes since I was unable to reproduce the issue and didn't understand why the the warning was not printed.

Ooops, I forgot to say: my flush=True changes may be removed if my latest change fixed the issue (if the warning is now displayed).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27829>
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