Validate apache2 mpm module switching for bug #5328

This patchset updates module integration testing to
validate the changes in PR #5454

This patchset instructs apache2_module to disable all
mpm modules, enable mpm_event, then disable mpm_event
and enable mpm_worker.

This patchset instructs apache2_module to disable all
mpm modules with `ignore_configcheck` set to False
and then disable all mpm modules with `ignore_configcheck`
set to True.

SuSe family of distributions do not ship apache2 with
mpm modules other than prefork. mpm_event and mpm_worker
checks are skipped for SuSe family of distributions.

Fixes: #5328

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

@@ -89,9 +89,88 @@
     force: True
   when: "ansible_os_family == 'Debian'"
 
-
 - name: enable evasive module, test https://github.com/ansible/ansible/issues/22635
   apache2_module:
     name: evasive
     state: present
   when: "ansible_os_family == 'Debian'"
+
+- name: disable mpm modules
+  apache2_module:
+    name: "{{ item }}"
+    state: absent
+    ignore_configcheck: True
+  with_items:
+    - mpm_worker
+    - mpm_event
+    - mpm_prefork
+  when: "ansible_os_family == 'Debian'"
+
+- name: enabled mpm_event
+  apache2_module:
+    name: mpm_event
+    state: present
+    ignore_configcheck: True
+  register: enabledmpmevent
+  when: "ansible_os_family == 'Debian'"
+
+- name: ensure changed mpm_event
+  assert:
+    that:
+      - 'enabledmpmevent.changed'
+  when: "ansible_os_family == 'Debian'"
+
+- name: switch between mpm_event and mpm_worker
+  apache2_module:
+    name: "{{ item.name }}"
+    state: "{{ item.state }}"
+    ignore_configcheck: True
+  with_items:
+    - name: mpm_event
+      state: absent
+    - name: mpm_worker
+      state: present
+  when: "ansible_os_family == 'Debian'"
+
+- name: ensure mpm_worker is already enabled
+  apache2_module:
+    name: mpm_worker
+    state: present
+  register: enabledmpmworker
+  when: "ansible_os_family == 'Debian'"
+
+- name: ensure mpm_worker unchanged
+  assert:
+    that:
+      - 'not enabledmpmworker.changed'
+  when: "ansible_os_family == 'Debian'"
+
+- name: try to disable all mpm modules with configcheck
+  apache2_module:
+    name: "{{item}}"
+    state: absent
+  with_items:
+    - mpm_worker
+    - mpm_event
+    - mpm_prefork
+  ignore_errors: yes
+  register: remove_with_configcheck
+  when: "ansible_os_family == 'Debian'"
+
+- name: ensure configcheck fails task with when run without mpm modules
+  assert:
+    that:
+      - "{{ item.failed }}"
+  with_items: "{{ remove_with_configcheck.results }}"
+  when: "ansible_os_family == 'Debian'"
+
+- name: try to disable all mpm modules without configcheck
+  apache2_module:
+    name: "{{item}}"
+    state: absent
+    ignore_configcheck: True
+  with_items:
+    - mpm_worker
+    - mpm_event
+    - mpm_prefork
+  when: "ansible_os_family == 'Debian'"