Rackspace support for switft module.
Rackspace support for switft module.

Allow setting auth_version, also don't make `password` a required field, can also use api_key.
Pass api_key in kwargs as `key`, that's what's expected in the utils module.
Also update notes with those details and a recommendation for using version 1 auth.

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt