Make apache2_mod_proxy work with Python 3, half-way modern Apache 2 versions, and add basic tests (#9762)

* Move Apache 2 installation to setup role.

* Make module work with Python 3.

* Add basic tests.

* Add changelog fragment.

* Simplify change.

* Pass referer.

tests/integration/targets/apache2_module/meta/main.yml

@@ -0,0 +1,7 @@
+---
+# Copyright (c) Ansible Project
+# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+dependencies:
+  - setup_apache2

tests/integration/targets/apache2_module/tasks/main.yml

@@ -8,21 +8,6 @@
 # GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-- name: install apache via apt
-  apt:
-    name: "{{item}}"
-    state: present
-  when: "ansible_os_family == 'Debian'"
-  with_items:
-    - apache2
-    - libapache2-mod-evasive
-
-- name: install apache via zypper
-  community.general.zypper:
-    name: apache2
-    state: present
-  when: "ansible_os_family == 'Suse'"
-
 - name: test apache2_module
   block:
     - name: get list of enabled modules