[issue25160] Stop using deprecated imp module; imp should now emit a real DeprecationWarning

[Brandt Bucher]

Change by Brandt Bucher <brandtbucher at gmail.com>:


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pull_requests: +11786, 11787
stage: needs patch -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue25160>
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