virt-libvirt: Allow to return CmdResult in virsh.domuuid.

Signed-off-by: Yu Mingfei<yumingfei@cn.fujitsu.com>
virt-libvirt: Add configuration for virsh domuuid test.

Signed-off-by: Yu Mingfei<yumingfei@cn.fujitsu.com>
virt-libvirt: Add test module for virsh domuuid.

Signed-off-by: Yu Mingfei<yumingfei@cn.fujitsu.com>