Git commits in Moodle 3.3.8 by Tim Hunt

commit 09cbca8566a388e8f0a1a0cfd86cd0667088ed2c
Author: Tim Hunt <T.J.Hunt@open.ac.uk>
Date:   Tue, 10 Jul 2018 01:37:45 +0800
Tag:    v3.3.8

MDL-62880 qtype_ddwtos: drop support for legacy import format

commit 78315808b179043ecf8efa79e95c8b10633322ab
Author: Tim Hunt <T.J.Hunt@open.ac.uk>
Date:   Fri, 22 Jun 2018 17:45:56 +0800
Tag:    v3.3.8

MDL-62781 question/privacy: fix tests with CodeRunner is installed