yum from cron setting http_proxy

[seth vidal]

> Add 'http_proxy=...' at the top of /etc/crontab (there should be already
> some variables).
> 
> But be warned; yum's proxy support is not complete as it does not
> support $no_proxy. Seems to be a general problem: the thing which is
> called "webbrowser" in Gnome2 does not have this either. :(

s/yum/python's/

http_proxy is not a function of yum it is done via urllib in python.

-sv