Unescape url to provide actual local path when adding box
Unescape url to provide actual local path when adding box

Fixes #6825

mitchellh/vagrant,bdwyertech/vagrant,marxarelli/vagrant,taliesins/vagrant,mwrock/vagrant,taliesins/vagrant,gitebra/vagrant,bdwyertech/vagrant,chrisroberts/vagrant,sni/vagrant,chrisroberts/vagrant,marxarelli/vagrant,bshurts/vagrant,justincampbell/vagrant,mitchellh/vagrant,benh57/vagrant,PatrickLang/vagrant,bdwyertech/vagrant,mwrock/vagrant,bryson/vagrant,bryson/vagrant,justincampbell/vagrant,sni/vagrant,bdwyertech/vagrant,bshurts/vagrant,gitebra/vagrant,mwrock/vagrant,PatrickLang/vagrant,PatrickLang/vagrant,chrisroberts/vagrant,taliesins/vagrant,gitebra/vagrant,sni/vagrant,sni/vagrant,mwrock/vagrant,PatrickLang/vagrant,taliesins/vagrant,bryson/vagrant,marxarelli/vagrant,benh57/vagrant,crashlytics/vagrant,mitchellh/vagrant,benh57/vagrant,crashlytics/vagrant,benh57/vagrant,marxarelli/vagrant,mitchellh/vagrant,crashlytics/vagrant,bshurts/vagrant,gitebra/vagrant,crashlytics/vagrant,chrisroberts/vagrant,justincampbell/vagrant,justincampbell/vagrant,bryson/vagrant,bshurts/vagrant