Swift API Updates

This PR updates the OpenStack Swift API to the latest standards. Here is what is included:

- Prefer `getSomeApi()` for all APIs
- Removed deprecated 1.8 methods
- Updated deprecations to the `*ForRegionAndBlah` methods to 3.0
- Whitespace cleanup
- Annotation reordering
@zack-shoylev That is my understanding as well. According to the docs:

> A @Path value isn’t required to have leading or trailing slashes (/). The JAX-RS runtime parses URI path templates the same whether or not they have leading or trailing spaces.