This test adds support in ct-test-srv for rejecting precertificates by
hostname, in order to artificially generate a condition where a
precertificate is issued but no final certificate can be issued. Right
now the final check in the test is temporarily disabled until the
feature is fixed.
Also, as our first Go-based integration test, this pulls in the
eggsampler/acme Go client, and adds some suport in integration-test.py.
This also refactors ct-test-srv slightly to use a ServeMux, and fixes
a couple of cases of not returning immediately on error.
Jacob Hoffman-Andrews