Description of problem:

When not online, and specifying -C in the command line, yum still tries to
contact a repository. When online, -C works well and reads from cache, but still
contacts a repository.

This is applicable when someone is offline and tries to search for some package
in the yum cache, doing for example:

yum -C search gxine


Version-Release number of selected component (if applicable):

I tried with these versions of yum:
   * yum-2.3.2-7
   * yum-2.3.4-0 (updates/fc4/testing)
   * yum-2.4.0-0 (updates/fc4/testing)

How reproducible:

Steps to Reproduce:
1. go offline or block your internet connection to the outside
2. yum -C search <package>
  
Actual results:

yum tries to contact a repository and waits for a very long time (or forever, I
didn't wait it for finish). Network activity shows that yum is trying to contact
some server on port 80.

Expected results:

yum should read only from the cache.