Recently our test environments were upgraded to use Docker 26, which
enabled ipv6 loopback by default in containers. This caused tests to
start failing due to an nginx test config which was the sole listener
for ipv6.
This simply removes that ipv6 listen directive in the config, and the
archived version we use for testing.
random25863.example.org appears in multiple port 80 virtualhosts in the
nginx testdata tarball and also is in the nginx-roundtrip-testdata.
Certbot doesn't handle these properly, which results in random test
failures.
This commit ensures that random25863.example.org only appears in a
single virtualhost and should ensure that the tests pass consistently.
Part of #5775.
* Create _internal folder certbot-nginx
* Move configurator.py to _internal
* Move constants.py to _internal
* Move display_ops.py to _internal
* Move http_01.py to _internal
* Move nginxparser.py to _internal
* Move obj.py to _internal
* Move parser_obj.py to _internal
* Move parser.py to _internal
* Update location and references for tls_configs
* exclude parser_obj from coverage
* rewrite nginx parser to allow everything that nginx does
* also make changes in tls_sni_01.py
* add test case with
* allow embedded variables
* allow empty ${} variable
* fix quotes
* un-special case if
* update all tests to reflect current parsing
* escape in QuotedString after merge
* add test cases for variable weirdness that are almost certainly nginx bugs
* update regex for correct variable rules
* close paren doesn't invoke last_space
* Make test file valid Nginx syntax
