* 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
* Be careful with new interaction from enabling nginx
* Fix py3 compataibility & better docs
* Make minor changes to @pde's PR to unhide nginx
* unhide nginx plugin
* Only protect against nginx interaction in cb-auto
* Change add_server_directives replace=True behavior to attempt to replace, but append on failure to find.
* Remove try/except around add_server_directives
* Revert "Don't save keys/csr on dry run (#4380)"
This reverts commit e034b50363.
* Don't save CSRs and keys during dry run
* Factor out _test_obtain_certificate_common
* Add test_obtain_certificate_dry_run
* Wrap key from make_key in util.Key
* Wrap result from make_csr in util.CSR
* 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
Fixes#4559.
* Update options-ssl-nginx.conf in prepare, if it hasn't been modified.
* add previous options-ssl-nginx.conf hashes
* InstallSslOptionsConfTest
* remove .new file and only print warning once
* save digest to /etc/letsencrypt
* add comment reminding devs to update hashes
* add comment and test for sha256sum
* treat hash file as text file because python3
* move constants and rename hidden digest file
* Switch to using include directive for Nginx constants
* remove deprecated comment
* give better error message when attempting to insert an existing directive
* make code more readable
* add docstrings
* allow a duplicated directive if it's identical
* comment out precisely repeated directives
* add comments
