Description of problem:
Running mock clutters/pollutes /var/log/messages with yum installation logs.


Version-Release number of selected component (if applicable):
mock-0.8.17-1.fc8
yum-3.2.8-2.fc8


How reproducible:
Always

Steps to Reproduce:
1. Build an arbitrary package using mock
2. Check /var/log/messages

  
Actual results:
Long series of yum logs in /var/log/messages related to mock invoking yum to
install packages inside of chroots.


Expected results:
mock/yum not to clutter /var/log/messages with yum-logs.

Additional info:
This renders yum-logs in /var/log/messages more or less void because "real yum
logs" can't be destinguished from "mock chroot yum-logs".