Add looping capability to regrtest

[jnoller]

BPO	7134
Nosy	@ezio-melotti
Superseder	bpo-7312: Run some tests in a loop until failure

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2009-11-13.00:14:40.995>
created_at = <Date 2009-10-14.23:40:02.382>
labels = ['tests']
title = 'Add looping capability to regrtest'
updated_at = <Date 2009-11-13.00:14:40.994>
user = 'https://bugs.python.org/jnoller'

bugs.python.org fields:

activity = <Date 2009-11-13.00:14:40.994>
actor = 'pitrou'
assignee = 'jnoller'
closed = True
closed_date = <Date 2009-11-13.00:14:40.995>
closer = 'pitrou'
components = ['Tests']
creation = <Date 2009-10-14.23:40:02.382>
creator = 'jnoller'
dependencies = []
files = []
hgrepos = []
issue_num = 7134
keywords = []
message_count = 1.0
messages = ['94052']
nosy_count = 2.0
nosy_names = ['jnoller', 'ezio.melotti']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = None
status = 'closed'
superseder = '7312'
type = None
url = 'https://bugs.python.org/issue7134'
versions = ['Python 2.7', 'Python 3.2']

[jnoller]

We should add "loop this test" capabilities to regrtest - running tests in
a tight loop can help debug issues which don't appear with a one-off run.

See:
http://mail.python.org/pipermail/python-dev/2009-June/090238.html