there is not "CHANGE_PASSWORD_DAYS" in /opt/iredapd/settings.py

==== Required information ====
- iRedMail version (check /etc/iredmail-release): 0.9.2
- Linux/BSD distribution name and version: ubuntu-14.04.2
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):Ldap
- Web server (Apache or Nginx):apache
- Manage mail accounts with iRedAdmin-Pro?
- Related log if you're reporting an issue:
====
i want to use plugin named ldap_force_change_password_in_days
but i can not find statement "CHANGE_PASSWORD_DAYS" in /opt/iredapd/settings.py