Description of problem:
Even if I use skip_if_unavailble=1 in the repo configuration yum fails to work properly when it's not available


Version-Release number of selected component (if applicable):
yum-3.4.3-28.fc17.noarch

How reproducible:
100%

Steps to Reproduce:
1. create a repo with unacessible url
2. yum update

  
Actual results:
[20:28:17 root@localhost ~]# yum update --noplugins
http://download.lab.bos.redhat.com/rel-eng/brew/fedora/17/repodata/repomd.xml: [Errno 14] curl#6 - "Couldn't resolve host"
Trying other mirror.
Error: failure: repodata/repomd.xml from brew: [Errno 256] No more mirrors to try.
[20:28:49 root@localhost ~]# cat /etc/yum.repos.d/brew.repo 
[brew]
name=Brew Buildsystem for Fedora $releasever - $basearch
baseurl=http://download.lab.bos.redhat.com/rel-eng/brew/fedora/$releasever/
enabled=1
gpgcheck=0
skip_if_unavailable=1

Expected results:
Repo skipped

Additional info:
It used to work...