Git commits in Moodle 2.9.0 by Nicolas Dunand

commit 0ac6a57ec5a6a2be9d5f2fc13e2dae5ac0321d4c
Author: Nicolas Dunand <nico@kolya.ch>
Date:   Mon, 01 Sep 2014 22:44:57 +0800
Tag:    v2.9.0-beta

MDL-26017 enrol: Add keyholder role