[maven] Mirroring maven repositories for oVirt

[Eyal Edri]

Since we all know that compiling oVirt on fedora for the first time downloads a very large amount of jars... 
We need to think about mirroring the maven repositories we're using.

There are a few advantages for that:
 * closer and faster servers
 * better control over the servers, meaning if the original repos are down, ours can still be online.
 * there is a chance we can be temporarily blocked if too many d/l are bring done. (or if some user d/l the entire repo using wget for e.g.)

here is info about mirroring from the maven site:
http://maven.apache.org/guides/mini/guide-mirror-settings.html

Eyal Edri.