Brining funtoo-latest-x86_64t into a workable state

The two commits fix several problems with the funtoo-latest-x86_64 templates.
It took me a few hours to solve the various problem with
* missing sshd initialization ( Authentication failure  Veewee::SshError)
* shutdown command did not work
* unable to boot (kernel had no initramfs, replaced real_root by root in grub.cfg)
* network setup/shared folders did not work as funtoo uses in /etc/init.d/ names like netif.lo, whereas gentoo uses net.lo.  Problem occured in lib/vagrant/guest/gentoo.rb
* disk size too low (I needed to create a 4 GB big database)
* I also upgraded to a newer version of funtoo.

Thanks for you work! I really like veewee.