[issue9308] Remove redundant coding cookies from 3.x stdlib

[Alexander Belopolsky]

Alexander Belopolsky <belopolsky at users.sourceforge.net> added the comment:

Is anyone interested in reviewing this patch before it is committed?  Since there are no user-visible changes and the only non-trivial change simply adds new tests, I think this can go in.  Any refinements can be done later.

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components: +Tests
keywords:  -needs review
stage: patch review -> commit review

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9308>
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