virt: Cpuflags test repair for new version of qemu

Qemu 1.3.50 changes cpu command line from -cpu ?cpuid,?dump,?models
to one command -cpu ?. -cpu ? command show joined information
only -cpu ?cpuid and -cpu ?models command. And developers don't
want add this functionality again because nobody use -cpu ?dump any more.
libvirt use file cpu_map.xml where should be all information about
cpu flags. And by this reason cpuflag test have to add this file too.
Moreover, it should help with check of qemu cpu flags stability.

Signed-off-by: Jiří Župka <jzupka@redhat.com>