Add a chutney network that does reachability tests
Chutney sets AssumeReachability 1 in all its networks.
We should make a network which doesn't set AssumeReachability, so we can test relay reachability changes.
As part of Sponsor 55, we want to make reachability chutney networks part of:
make test-networkmake test-network-all- Tor's Travis CI
- Chutney's Travis CI
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