[Libguestfs] Note guestfs-tools repo moved

I moved it under the github.com/libguestfs organization, which makes more sense: https://github.com/libguestfs/guestfs-tools This should require no action. github will redirect old URLs to the new location automatically. However you might wish to adjust your .git/config remotes to avoid seeing the warning that github prints each time. Rich. -- Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones Read my programming and virtualization blog: http://rwmj.wordpress.com nbdkit - Flexible, fast NBD server with plugins https://gitlab.com/nbdkit/nbdkit