Comment 1 for bug 521616

Ye that's kinda on purpose. Even with nifty conflicting rules, we found we couldn't reliably keep 5.0 and 5.1 in the same repo. To prevent more nasties happening, we've moved both 5.0 and 5.1 to new directories. This means that everybody will trip and just needs to adjust their paths to the appropriate version for them.

You can replace the old 'CentOS' in your paths with CentOS-MySQL50 or CentOS-MariaDB51, respectively. We're also creating new "release" RPMs for each tree to automatically set up the repo file for new installations. But editing your existing one will work fine too.