Update repository URLs in config.xml templates

Start using the new root repository for the split repositories.
The root repository contains the rest of the repository URLs from now
on.

Change-Id: Ie5e60fac092c23a98e32742937278ac7a996dc7d
Reviewed-by: Sergio Ahumada <sergio.ahumada@digia.com>
Reviewed-by: Akseli Salovaara <akseli.salovaara@digia.com>