Add Ganeti repo from http://jfut.integ.jp/linux/ganeti/

This adds a managed repo definition for a [Ganeti](http://code.google.com/p/ganeti/) repo with default URLs for [the most popular source](https://github.com/jfut/ganeti-rpm) (based on Google.com search results).  I've given it an initial priority of 15, though it shouldn't matter too much since it only contains Ganeti packages.