[issue43564] ftp tests in test_urllib2net fail instead of skipping on unreachable network

[Terry J. Reedy]

Change by Terry J. Reedy <tjreedy at udel.edu>:


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nosy: +giampaolo.rodola, orsenthil

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43564>
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