Swift v1 support

Modifying the work done by @ghemingway in #315 to make the `useServiceCatalog` option not required. Relevant changes are in https://github.com/pkgcloud/pkgcloud/blob/c78cd5023d2f1e6d390c04589c005c864a713c3b/lib/pkgcloud/openstack/storage/client/index.js