Remove Python 2 specific code (#877)

* Get rid of Python 2 special handling.

* Get rid of more Python 2 specific handling.

* Stop using six.

* ipaddress is part of the standard library since Python 3.

* Add changelog.

* Fix import.

* Remove unneeded imports.

plugins/module_utils/acme/utils.py

@@ -10,9 +10,9 @@ import datetime
 import re
 import textwrap
 import traceback
+from urllib.parse import unquote
 
 from ansible.module_utils.common.text.converters import to_native
-from ansible.module_utils.six.moves.urllib.parse import unquote
 from ansible_collections.community.crypto.plugins.module_utils.acme.errors import (
     ModuleFailException,
 )