[libvirt] [PATCH 10/13] Add XML parser extensions to the domain XML processing

This patch extends the domain XML processing to parse the top level referenced filter along with potentially provided parameters and also converts the internal data back into XML representation. Signed-off-by: Stefan Berger <stefanb@us.ibm.com> Signed-off-by: Gerhard Stenzel <gerhard.stenzel@de.ibm.com>