[fix] Properly deal with OpenStack errors.
[fix] Properly deal with OpenStack errors.

DonSchenck/pkgcloud,mcanthony/pkgcloud,temka1234/pkgcloud,mdsummers/pkgcloud,Phanatic/pkgcloud,hacor/pkgcloud,andrewsomething/pkgcloud,Phanatic/pkgcloud,songanbui/pkgcloud,dionjwa/pkgcloud,Hopebaytech/pkgcloud,pkgcloud/pkgcloud,bunglestink/pkgcloud,apla/pkgcloud