The reason for this PR is many bug fixes in the nginx plugin for changes we haven't released yet are included in #5220 which may not make our next release. If it doesn't, we will (mostly) revert the nginx plugin back to its previous state to avoid releasing these bugs and will revert this PR after the release.
* Revert "Nginx IPv6 support (#5178)"
This reverts commit 68e37b03c8.
* Revert "Fix bug that stopped nginx from finding new server block for redirect (#5198)"
This reverts commit e2ab940ac0.
* Revert "Nginx creates a vhost block if no matching block is found (#5153)"
This reverts commit 95a7d45856.
* Nginx IPv6 support
* Test and lint fixes
* IPv6 tests to Nginx plugin
* Make ipv6_info() port aware
* Named tuple values for readability
* Lint fix
* Requested changes
* Rename plugins.common.install_ssl_options_conf to plugins.common.install_version_controlled_file
* Install ssl_dhparams file
* Add installation test
* Add ssl_dhparam option when making a server block ssl
* add install_ssl_dhparams to Installer common plugin class
* Remove redundant code and tests
* update MANIFEST.in
* Add installer class
* Add wrapped reverter methods to common.Installer.
* Use Installer class in Apache plugin
* Use Installer class in Nginx plugin
* Don't create reverter in Apache and Nginx plugins
* Add TLS-SNI-01 support to Manual plugin
* Add environment variable CERTBOT_SNI_DOMAIN for manual-auth-hook
* Make AuthenticatorTest inherit from TempDirTestCase
* Add test_get_z_domain()
* Document CERTBOT_SNI_DOMAIN in docs/using.rst
* move install_ssl_options_conf functionality to common
* add no cover
* compute current hash instead of saving
* make current hash be computed; switch to list of all canonical hashes
* put message directly into assertion
* don't pass logger
* add docstring
* Add unit tests for certbot.plugins.common.install_ssl_options_conf
* Add OS X test
* Fix apache tests
* Use absolute path first so that certbot works with non-standard $PATH
Some tests use a fake $PATH, which prevents invoking `sw_vers`
* Also test Python 3 on Mac
* Set ulimit to fix "Too many open files"
* Move parse_server to be a method of NginxParser
* add super equal method to more correctly check addr equality in nginx should we support ipv6 in nginx in the future
* add addr:normalized_tuple method
* mark addresses listening sslishly due to another server block listening sslishly on that address
* test turning on ssl globally
* add docstring
* lint and remove extra file
