Added missing CLI switch to base box test example.
Added missing CLI switch to base box test example.

crashlytics/vagrant,PatrickLang/vagrant,crashlytics/vagrant,taliesins/vagrant,sni/vagrant,mitchellh/vagrant,bryson/vagrant,mitchellh/vagrant,bryson/vagrant,chrisroberts/vagrant,PatrickLang/vagrant,crashlytics/vagrant,marxarelli/vagrant,marxarelli/vagrant,gitebra/vagrant,gitebra/vagrant,PatrickLang/vagrant,mitchellh/vagrant,chrisroberts/vagrant,taliesins/vagrant,bryson/vagrant,chrisroberts/vagrant,gitebra/vagrant,crashlytics/vagrant,marxarelli/vagrant,mitchellh/vagrant,sni/vagrant,sni/vagrant,PatrickLang/vagrant,taliesins/vagrant,gitebra/vagrant,bryson/vagrant,marxarelli/vagrant,chrisroberts/vagrant,sni/vagrant,taliesins/vagrant