[issue15302] Use argparse instead of getopt in test.regrtest

[Roundup Robot]

Roundup Robot added the comment:

New changeset 6e2e5adc0400 by Chris Jerdonek in branch 'default':
Issue #15302: Switch regrtest from using getopt to using argparse.
http://hg.python.org/cpython/rev/6e2e5adc0400

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nosy: +python-dev

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