[issue10967] move regrtest over to using more unittest infrastructure

[R. David Murray]

R. David Murray added the comment:

Ah, but for me the point of running directly under unit test (and unittest discovery) it to be able to use the standard unittest facilities for running a single testcase or individual test.  Converting them to skips without making them run if regrtest isn't active might make things worse for that use case.  If we are going to convert them to skips, why not do it right to start with?  It won't any harder, since the logic will be baked into the skip decorators.

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<http://bugs.python.org/issue10967>
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