Git commits in Moodle 3.3.3 by Matt Petro

commit ae8ce02b74e742e884d88ecfa75761c9e010e723
Author: Matt Petro <matt.petro@wisc.edu>
Date:   Thu, 14 Sep 2017 22:39:09 +0800
Tag:    v3.3.3

MDL-60121 enrol: Fix enrol plugin backup