Git commits in Moodle 3.6.6 by Marina Glancy

commit 9684f897acbe8954a12b0b8e80e6c49f87432977
Author: Marina Glancy <marina@moodle.com>
Date:   Wed, 17 Jul 2019 00:33:35 +0800
Tag:    v3.6.6

MDL-66163 mod_forum: Add component to unittest sql queries