zanata-python-client: init failed to generate java-client compatable zanata.xml

After `zanata init`, zanata-python-client generated zanata.xml like this:

<?xml version="1.0" ?>
<config>

However, Java and maven client expected the header like:
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<config xmlns="http://zanata.org/namespace/config/">

Consequently , it did not work for Java client

Step to reproduce:
0. You need to have both Java and python client installed
1. init with python client, choose an existing project and version
zanata init
2. Try pull with python client
zanata pull
3. Try pull with java client
zanata-cli pull

Actual:
[INFO] Loading project config from zanata.xml
[ERROR] Execution failed:
javax.xml.bind.UnmarshalException: unexpected element (uri:"", local:"config"). Expected elements are <{http://zanata.org/namespace/config/}config>,<{http://zanata.org/namespace/config/}locale>,<{http://zanata.org/namespace/config/}rule>
at com.sun.xml.internal.bind.v2.runtim

Expected:
Pull successfully