Description of problem:
If a mirrorlist fails to download and it's the only mirrorlist for that repo
(such as the default .repos from fedora-release), yum will fail with the
seemingly incorrect "Cannot find a valid baseurl for repo: <repo>". Even with
-d9 -e9, there is no indication of the mirrorlist download failing.


Version-Release number of selected component (if applicable):
yum-2.6.1-0.fc5
yum-2.9.3-2


How reproducible:
Always


Steps to Reproduce:
rm -f /etc/resolv.conf
iptables -I INPUT -j REJECT
etc.

  
Actual results:
Cannot find a valid baseurl for repo: core
Error: Cannot find a valid baseurl for repo: core


Expected results:
At the very least a warning with the URLGrabError exception for diagnostics.


Additional info:
The attached patch doesn't do the Right Thing(tm), but I couldn't figure out how
to use a Logger from getMirrorList.