Use uint64 for memory size in Domain.SetMaxMemory
Use uint64 for memory size in Domain.SetMaxMemory

This matches the type used for the other memory-related functions, as
well as the type of the C function.

Signed-off-by: Christophe Fergeau <05b95054a663c388a4e33d95828cb30f0370f8ef@redhat.com>

libvirt/libvirt-go,libvirt/libvirt-go,libvirt/libvirt-go,libvirt/libvirt-go