[issue17066] Fix test discovery for test_robotparser.py

[Zachary Ware]

Zachary Ware added the comment:

I agree that, long-term, test_robotparser should probably be rewritten with less magic.  Short-term, though, I think it would be good to get a temporary fix for discovery in place since this is the only test file that completely blows up discovery before it even starts testing, and open a new issue for the rewrite.  The v3 patch does the job with the least disruption in the file, though it does add a bit more magic.

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<http://bugs.python.org/issue17066>
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