Fix broken Fedora 19 template

I ran into several problems while trying to get the Fedora 19 x86_64 template to work: networking was broken, the vagrant user was created twice, Chef didn't install, the latest kernel wasn't installed and there were tweaks like altering the sshd config and enabling updates-testing by default where I felt that they didn't belong in a base box. I basically started from scratch with a new ks.cfg and included is the result. I haven't updated the x86 template yet since I'm looking for feedback on this one first.