Description of problem:
Mirrorlists for disabled repos are downloaded during yum operations.

Version-Release number of selected component (if applicable):
yum-2.1.12-0.fc3 


How reproducible:
Always

Steps to Reproduce:
1. Create, e.g. /etc/yum.repos.d/jpackage.repo containing:
[jpackage16-fc]
name=JPackage 1.6 for Fedora Core 3
mirrorlist=http://www.jpackage.org/jpackage_fedora-3.txt
gpgcheck=1
failovermethod=priority
enabled=0

2. run ethereal and start capture
3. $ sudo yum install whatever
  
Actual results:
http request for mirrorlist of the disabled repo will be seen in capture.

Expected results:
No requests for mirrolists of disabled repos.

Additional info: