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

[Zachary Ware]

New submission from Zachary Ware:

Here's a patch to implement the idea I posted in issue18258, msg193242.  The patch also removes usage of "support.use_resources = ['<resource>']" from the test package since it is no longer needed.

(No test_main -> unittest.main conversions are done in this patch; the modules changed that still us. test_main are either covered by another issue or are more complex than a simple remove-and-replace conversion, and so I didn't want to lump them into this patch)

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components: Tests
files: regrtest_run.diff
keywords: patch
messages: 193310
nosy: ezio.melotti, r.david.murray, serhiy.storchaka, zach.ware
priority: normal
severity: normal
status: open
title: Add test.support.regrtest_run flag, simplify support.requires
type: enhancement
versions: Python 3.3, Python 3.4
Added file: http://bugs.python.org/file30968/regrtest_run.diff

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