[libvirt] [PATCH 0/5]: Add a API for query domain disk sizing info
This is somewhat late for the 0.8.1 release, but this is a rather
critical API for some of the use cases of RHEV. It introduces a
new API against a virDomainPtr to allow the direct querying of the
size of guest block devices. This is modelled on the virStorageVol
API for getting size, so I'm pretty confident on the design and
impl here.