demo account throttling

[Jack Bowling <jbinpg shaw ca>]

There was some discussion earlier about possible throttling of demo 
accounts by Red Hat. Well, it seems to be the case. Quite sensible, IMO.

===================
# up2date -u --nox --nosig

Error Message:
   Demo service for server 1002568897 limited due to high load
Error Class Code: 51
Error Class Info:
    Demo service currently disabled due to high load. If you would like
    to see Red Hat's policies on Demo service, or find out how you can
    purchase a subscription service and receive priority download access,
    please go to http://rhn.redhat.com/preview/index.pxt
====================

jb