* 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
* Addressing #4071 Wrote an ImmutableReturnMixin to prevent developers overriding return_value in certain Mock objects
* Language
* Loosening the assumption that underlying _mock objects need to be Immutable-like simplifies implementation
* Addressing #4071
* Ensure side_effects and return_values are pushed down to the underlying _mock in FreezableMocks. And IDisplay mocks are no longer frozen in _create_get_utility_mock()
* Edit a handful of tests to not override the mock_get_utility return_value
* Brief explainer of FreezableMock.__setattr__
* Incorporating PR feedback and some compatibility
* FreezableMock __getattr__ needs a shortcut in case of return_value or side_effect
* Changing return_value only forbidden if set before freezing
* Remove unnecessary else block
* Expanded doc strings
* Bring a couple new tests in line with patch_get_utility() norms
* 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 version number to bootstrap scripts.
* Always determine Bootstrap function and version.
* Write bootstrap version into venv.
* Add PrevBootstrapVersion function.
* Add OS bootstrapping check to phase 2.
* Differentiate -n and renew when rebootstrapping.
* Quote all environment variables.
* Correct test condition
* Add loud warning about hardcoded version list.
* s/VENV_BOOTSTRAP_VERSION/BOOTSTRAP_VERSION_PATH
* Properly handle noop bootstrap functions.
* Update comment about root usage.
* run all of certbot-auto as root
* remove other $SUDO uses from template
* remove $SUDO usage from bootstrappers
* default venv path = /opt/eff.org/certbot/venv
* Create symlinks from old default venvs
* Delete old venv path when it exists.
Also, quote expansion of paths.
* fix typo
* Separate venv_dir and le_auto_path
* Deduplicate code with test_dirs()
* Ignore cleanup errors.
This is caused by subdirectories being owned by root.
* Split test into test_phase2_upgrade.
* Rename test_dirs to temp_paths for clarity.
* Check both venvs before bootstrapping again.
* Use OLD_VENV_PATH/bin
* Preserve environment with sudo.
* Remove "esp. under sudo" comment.
* Export *VENV_PATH.
* Change check for OLD_VENV installation.
This approach better handles manually set VENV_PATH values.
* Remove SUDO_ENV.
* Print message before requesting root privileges.
* Make a function for selecting root auth method.
* Address @erikrose's feedback.
