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

[STINNER Victor]

STINNER Victor added the comment:

More warnings.

http://buildbot.python.org/all/builders/AMD64%20FreeBSD%209.x%203.x/builds/5058/steps/test/logs/stdio

Warning -- threading._dangling was modified by test_logging
Warning -- files was modified by test_io

http://buildbot.python.org/all/builders/AMD64%20FreeBSD%2010.x%20Shared%203.x/builds/5148/steps/test/logs/stdio

Warning -- threading._dangling was modified by test_logging
Warning -- threading._dangling was modified by test_asyncio
Warning -- files was modified by test_io

http://buildbot.python.org/all/builders/AMD64%20Windows10%203.x/builds/1573/steps/test/logs/stdio

Warning -- files was modified by test_distutils
Warning -- threading._dangling was modified by test_asyncio

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