Some OVF files to not declare 'rasd' as a default namespace (in the
top level Envelope element), but inline in each element (e.g.
<rasd:HostResource xmlns:rasd="foo">...</rasd:HostResource>)
This trips up our relative findvalue with
> XPath error : Undefined namespace prefix
To avoid this, search in the global XPathContext (where we register
those namespaces ourselves) and pass the item_node as context
parameter.
This works then for both cases
Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
