virt-libvirt: add configuration for virsh dominfo

Signed-off-by: Li Yang <liyang.fnst@cn.fujitsu.com>
virt-libvirt: modify virsh function for virsh dominfo

Signed-off-by: Li Yang <liyang.fnst@cn.fujitsu.com>
virt-libvirt: modify libvirt_vm where use virsh.dominfo

Signed-off-by: Li Yang <liyang.fnst@cn.fujitsu.com>
virt-libvirt: add test module for virsh dominfo

Signed-off-by: Li Yang <liyang.fnst@cn.fujitsu.com>