testbot/web: Always use a random prefix for the staging filename. (resubmit)

[Francois Gouget]

Starting with the session id means we'll have to try again to find a new unique filename.
---
 testbot/web/Submit.pl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/testbot/web/Submit.pl b/testbot/web/Submit.pl
index f73ae6a..0d9d0b4 100644
--- a/testbot/web/Submit.pl
+++ b/testbot/web/Submit.pl
@@ -794,7 +794,7 @@ sub OnSubmit
 
   # Make sure the file has a unique name even when not picked up directly
   # by the engine
-  my $FileNameRandomPart = $self->GetCurrentSession()->Id;
+  my $FileNameRandomPart = GenerateRandomString(32);
   while (-e ("$DataDir/staging/${FileNameRandomPart}_" .
              $self->GetParam("FileName")))
   {
-- 
2.0.0.rc0