[issue20262] Convert some debugging prints in zipfile to warnings

[Meador Inge]

Meador Inge added the comment:

LGTM.

I audited the other 'ZipFile.debug' uses and agree that the others are
mainly useful in debugging the zipfile implementation itself.

Since it isn't that critical of a change, the default branch should be
sufficient.

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nosy: +meador.inge
type:  -> behavior

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20262>
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