Git commits in Moodle 3.4.0 by Jakob Ackermann

commit d674f12b7c3b004ece2445910f1dc04a5fe4316e
Author: Jakob Ackermann <jackermann@onlineschool.ca>
Date:   Fri, 28 Apr 2017 06:23:43 +0800
Tag:    v3.4.0-beta

MDL-58744 blocks: Add system context block position in non user context.