Relicense plugins/module_utils/acme.py under GPLv3+. (#165)

The code was originally licensed under GPLv3+ when being part of the
letsencrypt module. It was relicensed under BSD 2-clause when moving
to Ansible's module_utils (https://github.com/ansible/ansible/pull/40697).
The code was only touched by two persons
(https://github.com/ansible/ansible/commits/pre-ansible-base/lib/ansible/module_utils/acme.py,
https://github.com/ansible-collections/community.crypto/commits/main/plugins/module_utils/acme.py)
and both persons consented in this PR
(https://github.com/ansible-collections/community.crypto/pull/165)
before it was merged.

changelogs/fragments/acme-module-utils-relicense.yml

@@ -0,0 +1,2 @@
+minor_changes:
+- "The ACME module_utils has been relicensed back from the Simplified BSD License (https://opensource.org/licenses/BSD-2-Clause) to the GPLv3+ (same license used by most other code in this collection). This undoes a licensing change when the original GPLv3+ licensed code was moved to module_utils in https://github.com/ansible/ansible/pull/40697 (https://github.com/ansible-collections/community.crypto/pull/165)."

plugins/module_utils/acme.py

@@ -1,14 +1,7 @@
 # -*- coding: utf-8 -*-
 
-# This code is part of Ansible, but is an independent component.
-# This particular file snippet, and this file snippet only, is BSD licensed.
-# Modules you write using this snippet, which is embedded dynamically by Ansible
-# still belong to the author of the module, and may assign their own license
-# to the complete work.
-#
-# Copyright (c), Michael Gruener <michael.gruener@chaosmoon.net>, 2016
-#
-# Simplified BSD License (see licenses/simplified_bsd.txt or https://opensource.org/licenses/BSD-2-Clause)
+# (c) 2016 Michael Gruener <michael.gruener@chaosmoon.net>
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
 
 from __future__ import absolute_import, division, print_function
 __metaclass__ = type