MDL-29862 incorrect wwwroot must be detected before session start

lib/setup.php

@@ -675,6 +675,9 @@ if (isset($_SERVER['PHP_SELF'])) {
     unset($phppos);
 }
 
+// initialise ME's - this must be done BEFORE starting of session!
+initialise_fullme();
+
 // init session prevention flag - this is defined on pages that do not want session
 if (CLI_SCRIPT) {
     // no sessions in CLI scripts possible
@@ -697,10 +700,6 @@ session_get_instance();
 $SESSION = &$_SESSION['SESSION'];
 $USER    = &$_SESSION['USER'];
 
-// initialise ME's
-// This must presently come AFTER $USER has been set up.
-initialise_fullme();
-
 // Late profiling, only happening if early one wasn't started
 if (!empty($CFG->profilingenabled)) {
     require_once($CFG->libdir . '/xhprof/xhprof_moodle.php');