Spring marshalXmlStreamWriter need respect StaxDriver

fix namespace issue

Comment From: snicoll

@qxo can you add a tes that reproduces the bug you're experiencing?

Comment From: qxo

XStreamMarshaller.setStreamDriver with StaxDriver and default namespace , then invoke the method you'll see the issue: not respect the default namespce!

    QNameMap qmap = new QNameMap();
            qmap.setDefaultNamespace("http://mycompany.com/sample-spring-ws");
            qmap.setDefaultPrefix("ns1");
            StaxDriver staxDriver = new StaxDriver(qmap);
        ... 
             setStreamDriver(staxDriver);           

Comment From: snicoll

@qxo that's not what I am asking. Can you please push an update to your PR with a @Test that reproduces the issue (and doesn't fail anymore with your change).

Comment From: poutsma

Merged in e8eeb99ac894dde7896d080c0bcb18335e49ee78

Thank you for leaving a PR, and sorry for taking this long to resolve it.