Replace all legacy events related to User.
admin/tool/uploaduser/index.php: events_trigger('user_updated', $existinguser);
admin/tool/uploaduser/index.php: events_trigger('user_created', $user);
admin/user.php: events_trigger('user_updated', $user);
admin/user.php: events_trigger('user_updated', $user);
auth/email/auth.php: events_trigger('user_created', $user);
auth/ldap/auth.php: events_trigger('user_created', $user);
lib/enrollib.php: events_trigger('user_enrolled', $ue);
lib/enrollib.php: events_trigger('user_enrol_modified', $ue);
lib/enrollib.php: events_trigger('user_enrol_modified', $ue);
lib/enrollib.php: events_trigger('user_unenrolled', $ue);
lib/enrollib.php: events_trigger('user_unenrolled', $ue);
lib/eventslib.php:function events_trigger($eventname, $eventdata) {
lib/moodlelib.php: events_trigger('user_logout', $params);
lib/moodlelib.php: events_trigger('user_created', $DB->get_record('user', array('id'=>$user->id)));
lib/moodlelib.php: events_trigger('user_updated', $DB->get_record('user', array('id'=>$oldinfo->id)));
lib/moodlelib.php: events_trigger('user_deleted', $user);
enrol/manual/locallib.php: events_trigger('user_enrol_modified', $enrolment);
user/edit.php: events_trigger('user_updated', $usernew);
user/editadvanced.php: events_trigger('user_created', $usernew);
user/editadvanced.php: events_trigger('user_updated', $usernew);
user/emailupdate.php: events_trigger('user_updated', $user);
user/lib.php: events_trigger('user_created', $newuser);
user/lib.php: events_trigger('user_updated', $updateduser);

Please also check user/lib.php user_update_users() from MDL-34422 (if it has been integrated)
events_trigger('user_updated', $user);