[issue18492] Add test.support.regrtest_run flag, simplify support.requires

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I don't think we should accept anything if not running under regrtest, We can unintentionally run a testfile in which some tests consume a lot of resources. Also we need in skipping this tests for the test testing. I think it will be better just add a support of the -u option to discovery command line interface.

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<http://bugs.python.org/issue18492>
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