[issue30871] Add a "python info" command somewhere to dump versions of all dependencies

[STINNER Victor]

STINNER Victor added the comment:

> I plan to backport Lib/test/pythoninfo.py and "make pythoninfo" to Python 2.7 and 3.6 to ease debug on all supported Python branches.

Oh, but I will first only run pythoninfo on buildbot for the master branch, since I expect surprises depending on the platform :-) Once everything is fine, I will backport the enhancement to other branches.

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<http://bugs.python.org/issue30871>
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