[issue26639] Tools/i18n/pygettext.py: replace deprecated imp module with importlib

[Berker Peksag]

Changes by Berker Peksag <berker.peksag at gmail.com>:


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components:  -Benchmarks, Unicode
stage:  -> patch review
type: compile error -> enhancement
versions:  -Python 2.7, Python 3.2, Python 3.3, Python 3.4, Python 3.5

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue26639>
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