ZP-552 #comment Autodiscover does not work for iOS devices

git-svn-id: https://z-push.org/svn/z-push/trunk@1909 b7dd7b3b-3a3c-0410-9da9-bee62a6cc5b5

src/autodiscover/response.xml

 <?xml version="1.0" encoding="utf-8"?>
-<Autodiscover xmlns="http://schemas.microsoft.com/exchange/autodiscover/mobilesync/responseschema/2006">
+<Autodiscover xmlns="http://schemas.microsoft.com/exchange/autodiscover/responseschema/2006" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
 <Response>
 <Culture>en:us</Culture>
 <User>