[api minor] Expose availability-zones for amazon
[api minor] Expose availability-zones for amazon

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