Fix privilege changing everytime (#438)

* Compare privileges from before and after manipulation

* Add unit tests

* Fix FIXME integration tests related to this issue

* Fix sanity check

* Fix assertion when appending privs in mysql_role_initial integration tests

* Fix pylint

* [ci-skip] Add changelog fragment

* Fix: missing fragment file extension

* Replace privileges_equal() by a comparison

* Fix: sanity pylint

* Fix: forgot to remove privileges_equal import from unit tests

tests/integration/targets/test_mysql_role/tasks/mysql_role_initial.yml

@@ -1491,16 +1491,10 @@
       priv: '{{ test_db1 }}.{{ test_table }}:SELECT,INSERT/{{ test_db2 }}.{{ test_table }}:DELETE'
       append_privs: yes
 
-  # TODO it must be changed. The module uses user_mod function
-  # taken from mysql_user module. It's a bug / expected behavior
-  # because I added a similar tasks to mysql_user tests
-  # https://github.com/ansible-collections/community.mysql/issues/50#issuecomment-871216825
-  # and it's also failed. Create an issue after the module is merged to avoid conflicts.
-  # TODO Fix this after user_mod is fixed.
-  - name: Check
+  - name: Check that there's no change
     assert:
       that:
-      - result is changed
+      - result is not changed
 
   - name: Rewrite privs
     <<: *task_params

tests/integration/targets/test_mysql_user/tasks/test_privs.yml

@@ -179,8 +179,6 @@
       assert:
         that:
           - result is not changed
-      when: (install_type == 'mysql' and mysql_version is version('8', '<')) or
-            (install_type == 'mariadb' and mariadb_version is version('10.5', '<'))
 
     - name: remove username
       mysql_user:
@@ -229,8 +227,6 @@
       assert:
         that:
           - result is not changed
-      when: (install_type == 'mysql' and mysql_version is version('8', '<')) or
-            (install_type == 'mariadb')
 
     - name: Collect user info by host
       community.mysql.mysql_info: