Vagrantfile: Add network fix + boot_timeout
Vagrantfile: Add network fix + boot_timeout

Fixes based on tutorial http://www.liviubalan.com/vagrant-install-ubuntu-precise32-and-ubuntu-trusty32-on-linux-mintubuntu-desktop-inside-virtualbox

liviubalan/liviubalan.com-vagrant-ubuntu,liviubalan/liviubalan.com-vagrant-ubuntu,liviubalan/liviubalan.com-vagrant-ubuntu