All the tests pass. I tried to keep as much as possible the same, but a
few things don't translate well to Caddy 2, notably one test in
probe_resist_test.go on L200, I had to change that test case since I
didn't quite understand why it was the way it was before.
Does not yet have v2 Caddyfile support.
We settled on a powerful, but a bit complicated acl design.
This commit makes a couple of cosmetic improvements. It also removes
http.Transport, which was previously used to dial and write http
requests for insecure GET requests. Now we have to dial manually,
so we can check the access control list.
