MDL-39888 mnet: Added a warning message that no logging may be reveived from other clients.

Moodle client machines that are running 2.6 or above that are not using the legacy log store
will not generate any logs to be transfered to the parent site.

report/log/index.php

@@ -154,6 +154,7 @@ if (!empty($chooselog)) {
                 admin_externalpage_setup('reportlog');
                 $PAGE->set_title($course->shortname .': '. $strlogs);
                 echo $OUTPUT->header();
+                echo $OUTPUT->notification(get_string('mnetlogwarning', 'report_log'));
 
             } else {
                 $PAGE->set_title($course->shortname .': '. $strlogs);

report/log/lang/en/report_log.php

@@ -26,6 +26,7 @@
 
 $string['log:view'] = 'View course logs';
 $string['log:viewtoday'] = 'View today\'s logs';
+$string['mnetlogwarning'] = 'If your MNet clients are running Moodle 2.7 or higher, then you may not receive any logs.';
 $string['page'] = 'Page {$a}';
 $string['logsformat'] = 'Logs format';
 $string['page-report-log-x'] = 'Any log report';