Author: Jun Pataleta
MDL-65950 core_user: Add hidden labels for the user checkboxes
* And update Behat tests accordingly and nuke the steps that are using
xpath.
http://git.moodle.org/gw?p=moodle.git;a=commit;h=1cac0870b800b3124f4b26ec24408714e29fe061
http://github.com/moodle/moodle/commit/1cac0870b800b3124f4b26ec24408714e29fe061
+ 3.8 en [selectitem,core]