[minor] hardcoding v2.0 for rackspace validateToken
[minor] hardcoding v2.0 for rackspace validateToken

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