mysql_user: fix parsing privs when a user has roles assigned to it (#341)

* mysql_user: fix parsing errors when a user has roles assigned

* Add a changelog fragment

* Fix a typo

* Fix CI

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

@@ -1540,3 +1540,24 @@
     - '{{ test_db }}'
     - '{{ test_db1 }}'
     - '{{ test_db2 }}'
+
+  - name: Drop users
+    <<: *task_params
+    mysql_user:
+      <<: *mysql_params
+      name: '{{ item }}'
+      state: absent
+    loop:
+    - '{{ user0 }}'
+    - '{{ user1 }}'
+    - '{{ user2 }}'
+
+  - name: Drop roles
+    <<: *task_params
+    mysql_role:
+      <<: *mysql_params
+      name: '{{ item }}'
+      state: absent
+    loop:
+    - '{{ role0 }}'
+    - test