Implement the setup.py -> setup.cfg in mkcfg

[alaintty]

BPO	11028
Nosy	@tarekziade, @merwok

^{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 = 'https://github.com/tarekziade'
closed_at = <Date 2011-06-09.14:51:10.935>
created_at = <Date 2011-01-27.14:45:08.121>
labels = ['type-feature']
title = 'Implement the setup.py -> setup.cfg in mkcfg'
updated_at = <Date 2011-06-09.14:51:10.933>
user = 'https://bugs.python.org/alaintty'

bugs.python.org fields:

activity = <Date 2011-06-09.14:51:10.933>
actor = 'eric.araujo'
assignee = 'tarek'
closed = True
closed_date = <Date 2011-06-09.14:51:10.935>
closer = 'eric.araujo'
components = ['Distutils2']
creation = <Date 2011-01-27.14:45:08.121>
creator = 'alaintty'
dependencies = []
files = []
hgrepos = []
issue_num = 11028
keywords = []
message_count = 2.0
messages = ['127197', '137978']
nosy_count = 4.0
nosy_names = ['tarek-ziade', 'tarek', 'eric.araujo', 'alaintty']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue11028'
versions = ['Python 3.3']

[alaintty]

It shall be interesting to simplify the building of the setup.cfg from an existing setup.py.
A distutils2.mkcfg.load_existing_setup_script function already exists but it raises NotImplementedError.
Since taking into account setuptools could be straightforward we propose to add a implementation that takes care of distutils arguments only.

[merwok]

This is now implemented in packaging.create.MainProgram.convert_py_to_cfg.