Add extra key for vbox driver with listing hdds
Add extra key for vbox driver with listing hdds

mitchellh/vagrant,marxarelli/vagrant,sni/vagrant,marxarelli/vagrant,marxarelli/vagrant,mitchellh/vagrant,sni/vagrant,mitchellh/vagrant,marxarelli/vagrant,chrisroberts/vagrant,sni/vagrant,chrisroberts/vagrant,mitchellh/vagrant,chrisroberts/vagrant,sni/vagrant,chrisroberts/vagrant