auth_user.pasword is NOT NULL, you can't set it to null

! should be understood by django to mean "no password set".  It's handled
better in newer versions, but even in 1.4 it doesn't cause the "login
hangs" errors on stage like '' does.

util/vpc-tools/sanitize-db-wwc.sql

@@ -6,11 +6,11 @@ SET FOREIGN_KEY_CHECKS=0;
 
 UPDATE auth_user
     set
-        password = null;
+        password = '!';
 
 UPDATE student_passwordhistory
     set
-        password = null;
+        password = '!';
 
 /*
   Rewrite all emails to used the SES simulator, simulating success.