- Update formatting of XML fragments used in tests.  The now use   string interpolation to inject the AWS API version and all start   the opening <?xml> prolog on a new line.
- Update formatting of XML fragments used in tests.  The now use
  string interpolation to inject the AWS API version and all start
  the opening <?xml> prolog on a new line.

mithrandi/txaws,twisted/txaws,oubiwann/txaws,twisted/txaws,mithrandi/txaws,oubiwann/txaws