Remove all non essential references to the old Zope interfaces (#8988)

As a follow-up to #8971, this PR removes all references to the old Zope interfaces, except the ones used to deprecate them and prepare for their removal.

In the process, some documentation and tests about the `Display` objects are simply removed since they are not relevant anymore given that they are removed from the public API.

* Cleanup some interfaces.IInstaller

* Cleanup IConfig doc

* Allmost complete removal

* Remove useless tests

* Fixes

* More cleanup

* More cleanup

* More cleanup

* Remove a non existent reference

* Better type

* Fix lint

certbot-apache/certbot_apache/_internal/configurator.py

@@ -121,7 +121,7 @@ class ApacheConfigurator(common.Installer, interfaces.Authenticator):
     """Apache configurator.
 
     :ivar config: Configuration.
-    :type config: :class:`~certbot.interfaces.IConfig`
+    :type config: certbot.configuration.NamespaceConfig
 
     :ivar parser: Handles low level parsing
     :type parser: :class:`~certbot_apache._internal.parser`

certbot-apache/certbot_apache/_internal/constants.py

@@ -4,11 +4,13 @@ import pkg_resources
 from certbot.compat import os
 
 MOD_SSL_CONF_DEST = "options-ssl-apache.conf"
-"""Name of the mod_ssl config file as saved in `IConfig.config_dir`."""
+"""Name of the mod_ssl config file as saved
+in `certbot.configuration.NamespaceConfig.config_dir`."""
 
 
 UPDATED_MOD_SSL_CONF_DIGEST = ".updated-options-ssl-apache-conf-digest.txt"
-"""Name of the hash of the updated or informed mod_ssl_conf as saved in `IConfig.config_dir`."""
+"""Name of the hash of the updated or informed mod_ssl_conf as saved
+in `certbot.configuration.NamespaceConfig.config_dir`."""
 
 # NEVER REMOVE A SINGLE HASH FROM THIS LIST UNLESS YOU KNOW EXACTLY WHAT YOU ARE DOING!
 ALL_SSL_OPTIONS_HASHES = [

certbot-apache/certbot_apache/_internal/override_void.py

@@ -1,12 +1,8 @@
 """ Distribution specific override class for Void Linux """
-import zope.interface
-
-from certbot import interfaces
 from certbot_apache._internal import configurator
 from certbot_apache._internal.configurator import OsOptions
 
 
-@zope.interface.provider(interfaces.IPluginFactory)
 class VoidConfigurator(configurator.ApacheConfigurator):
     """Void Linux specific ApacheConfigurator override class"""