Git commits in Moodle 3.6.0 by Paul Holden

commit f56e6958835b15e0f61d98a9d525268311d38b57
Author: Paul Holden <pholden@greenhead.ac.uk>
Date:   Fri, 07 Sep 2018 21:18:45 +0800
Tag:    v3.6.0-beta

MDL-60028 enrol: fix counting of enrolled users in a given context.