Git commits in Moodle 3.5.4 by Ilya Tregubov

commit daa7d65f3449f9ee2fba6f31d07028e281c536fd
Author: Ilya Tregubov <ilyatregubov@catalyst-au.net>
Date:   Wed, 21 Nov 2018 11:44:23 +0800
Tag:    v3.5.4

MDL-63710 repository: Delete orphaned file records.