Description:
------------
1) When a wsdl import external xsd, bad ns1:"defaultnamespace",  Envelope namespace bindings iscreated. Is there a way to drop it off?

2) Impossible to add custom namespace bindings to the root element


See http://cert.webservices.sabre.com/wsdl/sabreXML1.0.00/tpf/OTA_CancelLLSRQ.wsdl for a sample WSDL

Reproduce code:
---------------
<?php
$objClient = new SoapClient(
	"http://cert.webservices.sabre.com/wsdl/sabreXML1.0.00/tpf/OTA_CancelLLSRQ.wsdl"
	,array('trace'       => 1
		,'exceptions'   => 0
		, 'encoding'    => 'utf-8'
	)
);
$objClient->__setLocation("https://cert.webservices.sabre.com/tsts");

$xml =
'<OTA_CancelRQ />';

$soapvar = new SoapVar($xml, XSD_ANYXML);
$objResponse = $objClient->__soapCall("OTA_CancelRQ", array($soapvar));
var_dump($objClient->__getLastRequest());


Expected result:
----------------
<SOAP-ENV:Envelope 
	xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/" 
	xmlns:eb="http://www.ebxml.org/namespaces/messageHeader" 
	xmlns:xlink="http://www.w3.org/1999/xlink" 
	xmlns:xsd="http://www.w3.org/1999/XMLSchema">

Actual result:
--------------
<SOAP-ENV:Envelope 
    xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/"  
    xmlns:ns1="http://webservices.sabre.com/sabreXML/2003/07">