[Libvir] Bug in the virDomainGetInfo() API of libvirt 0.1.9 with Xen 3.0.3

[Philippe Berthault <Philippe Berthault Bull net>]

The maxMem field of the virDomainInfo structure is given in bytes 
instead of Kbytes when the domain is 0 (Domain-0). With others domains, 
the value of maxMem is correct.

Exemple with virsh:
 On a system with 4 GB memory, virsh reports:
 # virsh dominfo 0
 ...
 Max memory: 4294967292 kB

With the same libvirt version 0.1.9 but with an older Xen (not 3.0.3), 
the maxMem value of Domain-0 is correct.