Git commits in Moodle 3.11.x by Dmitri Pisarev

commit aa59c122df8e78ba91310b8bcbc76b4f259052a1
Author: Dmitri Pisarev <dimaip@gmail.com>
Date:   Tue, 22 Jan 2019 16:09:26 +0800
Tag:    v3.11.2

MDL-63770 core: Fix a false-positive in `reverseproxyabused` check