Values set in OSGi ConfigAdmin do not get written to standalone.xml

When a configuration value gets set in the OSGi Configuration Admin Service this value should get persisted in the configadmin section of standalone.xml.

The ConfigurationAdminTestCase (in as7 testsuite/integration/basic) contains this code:

        Configuration config = configAdmin.getConfiguration(ConfiguredService.SERVICE_PID);
        assertNotNull("Config not null", config);
        try
        {
            Dictionary<String, String> configProps = new Hashtable<String, String>();
            configProps.put("foo", "bar");
            config.update(configProps);

When running this test case with AS7 running I can see that it is run in the server.
I was expecting the foo=bar configuration to appear in the configadmin section of standalone.xml, but it doesn't appear there.