Added more details on how to use vagrant-libvirt with QEMU user sessions
Added more details on how to use vagrant-libvirt with QEMU user sessions

pradels/vagrant-libvirt,vagrant-libvirt/vagrant-libvirt,electrofelix/vagrant-libvirt,vagrant-libvirt/vagrant-libvirt,electrofelix/vagrant-libvirt,pradels/vagrant-libvirt,electrofelix/vagrant-libvirt,vagrant-libvirt/vagrant-libvirt