Fixes two small bugs in Keystone recipe/metadata

* metadata.rb needs space between >= and version in depends
* not_if needs { } braces around the code block
Forgot to change credentials provider when did register

* Update the credentials provider in the same way as the
  keystone_register provider to remove auth_token and put
  in auth_uri, admin_user, admin_password, and admin_tenant_name
Removes extraneous private markers
Merge pull request #20 from jaypipes/working

Bug fixes and Keystone credentials provider