[issue18258] Fix test discovery for test_codecmaps*.py

[Zachary Ware]

Zachary Ware added the comment:

R. David Murray wrote:
> So, the fact that the tests don't run if discovery is used is still a
> bug.  I'm not sure how we fix it, given the nature of the resource.

My preferred solution short of adding resource management to unittest is to add a "regrtest_run" flag to test.support, defaulting to False and set to True by regrtest (like verbose, use_resources, etc.).  Then we can replace the sys._getframe hack in support.requires with a simple check of support.regrtest_run.  If it's False, return.  This way, running the test module directly or via discovery will work the same way: all resources enabled.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18258>
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