Description of problem:
Yum from F7 ignores http_caching settings and always ignored and packages are
redownloaded for each try.

Version-Release number of selected component (if applicable):
yum-3.2.0-1.fc7 and yum-3.2.1-1.fc7 too

How reproducible:
Always.

Steps to Reproduce:
1. yum install nexuiz-data -y # or any other large package
2. wait for aprox. 20-80% to download
3. break yum with ctrl-c
4. yum install nexuiz-data -y # start it again
  
Actual results:
Yum is downloading this pachage again from 0%, 0 bytes. I can see in
/var/cache/yum/fedora/packages, that file has been redownloaded from 0 bytes
again. :(

Expected results:
Continue downloading. This was ok in fedora core 6, but does not working in F7.

Additional info:
I have tryed to use 'http_caching=all' yum.conf parameter without success.