Build system maintenance complete

[Dan Williams]

Hi,

I've updated and restarted the build system this morning to fix issues
many of you may have noticed with jobs stuck in downloading/done state.
Things should be flowing more smoothly now.

The problem was caused by plague using blocking sockets for RPM
downloads, which weren't playing well with SSL and firewall/iptables on
the builders.  We now use non-blocking sockets with timeouts for RPM
downloads, and retry downloads up to 5 times before failing the job.

If you notice your job sitting in downloading/done for more than 10 or
15 minutes (it's normal to be in that state for a short time), please
email me the job # and I'll look at the logs to see what really went on
and hopefully fix it.

Thanks for the patience.

Dan