It's old question but situation with users synchronization between MySQL and AD/LDAP stays the same at all, except some commercial tools. But a while ago utility forked from EnterpriseDB pgldapsync appeared - myldapsync. Maybe it could be heplfull for someone.

PyPI page - https://pypi.org/project/myldapsync/

GitHub page - https://github.com/6eh01der/myldapsync