workaround 'Network is unreachable' errors in new CI #353
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Motivation:
In the new CI, ChannelTests.testGeneral/SpecificConnectTimeout often fails with
It's not a great test but this just works around it by saying that if
the network's down that's fine too.
Modifications:
also accept ENETDOWN and ENETUNREACH
Result:
tests should pass in new CI.