[libvirt] [PATCH v1 0/2] Fixes to network filter rules instantiator + XML parser and XML parser test cases

The following two patches fix some problems when instantiating the network filtering rules provided by the test cases in the 2nd patch on a running virtual machine using 'nwfilter-define'. There's one known problem realted to 'dscp' values not being capped at '63'. This will be fixed later. Regards, Stefan