[issue8739] Update to smtpd.py to RFC 5321

[Michele Orrù]

Michele Orrù <maker.py at gmail.com> added the comment:

I'm currently working on this issue. 
A little cleanup would be appreciated, or it would be better to split that on another issue?
For what I saw, tests are in the form FooTest instead of TestFoo, smtpd imports modules used only in __main__, warnings can be handled the appropriate module, __import__ shall not be used.

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nosy: +maker

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<http://bugs.python.org/issue8739>
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