[issue21722] teach distutils "upload" to exit with code != 0 when error occurs

[Ned Deily]

Changes by Ned Deily <nad at acm.org>:


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components: +Distutils
nosy: +dstufft, eric.araujo

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21722>
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