Tests: add integration test for password changes by dir mgr
Add a test for issue 7601:
- add a user, perform kinit user to modify the password, read krblastpwdchange
and krbpasswordexpiration.
- perform a ldapmodify on the password as dir mgr
- make sure that krblastpwdchange and krbpasswordexpiration have been modified
- perform the same check with ldappasswd
Related to:
https://pagure.io/freeipa/issue/7601
Reviewed-By: Thierry Bordaz <tbordaz@redhat.com>