--net=host containers

[tianon]

If a container is set to --net=host, it gets no IP, which is obviously less than helpful for us. We should be able to figure out something for this case, but exactly what would be "correct" here is debatable.

[emberdart]

Isn't that just localhost, though? I'd argue that this shouldn't go through this service... since the IP is shared, any port listened on and not even "exposed" (which isn't really a thing anymore) is just on localhost.