tests: conditionally skip network-dependent tests

GothenburgBitFactory / bugwarrior

Pull github, bitbucket, and trac issues into taskwarrior

http://pypi.python.org/pypi/bugwarrior

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Closed ryneeverett closed 1 year ago

ryneeverett commented 1 year ago

sphinx-build gives a warning if it can't access external resources, which cause these tests to fail