Git commits in Moodle 3.6.4 by Ryan Wyllie

commit 9075a96e5d35bd085cc9cc8dc206e2842fa10ff6
Author: Ryan Wyllie <ryan@moodle.com>
Date:   Tue, 30 Apr 2019 13:29:56 +0800
Tag:    v3.6.4

MDL-65446 admin: fix admin email option for cli install


commit 07d60fe33435a7b774ee63bebc5b7e565a44581b
Author: Ryan Wyllie <ryan@ryanwyllie.com>
Date:   Mon, 29 Apr 2019 15:51:38 +0800
Tag:    v3.6.4

MDL-65134 core_message: Introduce event specific function