[issue3959] Add Google's ipaddr.py to the stdlib

[pmoody]

pmoody <python at hda3.com> added the comment:

as one of the owners listed in the code.google.com project (same name),
and the original author, you certainly have my approval for inclusion in
python.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue3959>
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