virt-libvirt: add configuration for virsh domstate

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

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

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

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