Git commits in Moodle 3.9.0 by Iñigo Zendegi

commit befbe2838f78ccb5a7774cfb91d65e34d89eb355
Author: Iñigo Zendegi <izendegi@mondragon.edu>
Date:   Tue, 03 Sep 2019 20:46:15 +0800
Tag:    v3.9.0-beta

MDL-66581 auth: Do string concatenation for the password change URL