Add identifier option to apache2_module (#33748)

* Add identifier option to apache2_module

There is a convention connecting the name passed to a2enmod and the one
appearing in apache2ctl -M. Not all modules follow this convention and
we have added a growing list of implicit conversions.
As a better long-term solution this adds an "identifier" option to be
able to set both strings explicitly.

* Run debian-specific tests only there

* Improve cleanup after apache2 tests

This is a follow-up/extension of https://github.com/ansible/ansible/pull/33630

* Add example for the new identifier option

* Put all debian tests in a block

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

@@ -1,11 +1,21 @@
 ---
 
+
 - name:
   block:
+    - name: get list of enabled modules
+      shell: apache2ctl -M | sort
+      register: modules_before
     - name: include only on supported systems
       include: actualtest.yml
   always:
-     - name: cleanup installed modules
-       include: cleanup.yml
+    - name: get list of enabled modules
+      shell: apache2ctl -M | sort
+      register: modules_after
+    - debug: var=modules_before
+    - debug: var=modules_after
+    - name: ensure that all test modules are disabled again
+      assert:
+        that: modules_before.stdout == modules_after.stdout
   when: ansible_os_family in ['Debian', 'Suse']
   # centos/RHEL does not have a2enmod/a2dismod