[issue34381] Make tests with outbound connection optional

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:

An additional motivation for the change is that the instructions in the Testing section of the README are make based while the devguide section gives the OS- and version-specific 'python' based commands.

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nosy: +terry.reedy

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<https://bugs.python.org/issue34381>
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