[libvirt] [PATCH 0/4] Update interface xml to match netcf 0.1.5

The first two patches make minor additions to the parsing/formatting. The 3rd is a bit more intrusive, as it switches from using virInterfaceBareDef for subordinate interfaces to recursively using a full virInterfaceDef (but with guaranteed closure due to limiting the type of subordinate interface allowed based on parent interface). The final patch updates the RNG and test files accordingly.