Git commits in Moodle 3.7.1 by Jake Dallimore

commit 4a2a533fe1169b3efaffd76686a8e5359fa220f8
Author: Jake Dallimore <jake@moodle.com>
Date:   Wed, 26 Jun 2019 16:07:49 +0800
Tag:    v3.7.1

MDL-65249 session: use redis host constant in unit tests