[issue8533] regrtest: use backslashreplace error handler for stdout

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

> A better resolution IMO would be to output tracebacks on stderr instead.

Yeah, that sounds easier and safer. Attached patch writes the tracebacks to stderr.

I don't remember how to reproduce this issue :-/ I guess that stdout/stderr encoding should be ASCII (eg. LANG="") and the traceback (eg. the error message) should contain a non-ASCII character.

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Added file: http://bugs.python.org/file17093/regrtest_traceback_stderr.patch

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