[Rpm-metadata] [Patch] createrepo --check option take two

[seth vidal]

> More than that, this is an overwhelming progress in my eyes.
> 
> Unfortunately I'm away from my office ATM, will check out the code and 
> test it as soon as I'm back (next week at latest). Do you see a 
> probability, that if the timestamp check would be applied to the 
> checksum files, could further improve that runtime behavior, or would 
> it just add unnecessary complexity?

To be honest I think the timestamp checking could be too failure-prone
for most cases. Let's leave it out and see how it goes.

Let me know what you think of the createrepo changes as they are.

Thanks!
-sv