[issue30442] Skip test_xml_etree under coverage

[Berker Peksag]

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


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components: +Tests
stage:  -> backport needed
versions: +Python 3.6

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue30442>
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