add case for vm transfer packet to remote host by udp

[nanli1]

xxxx-300100:[virtual network][virtual-nic-device]The local VM can transfer length 1473-1480 packets to remote host through UDP
Signed-off-by: nanli [email protected]

hi all reviewers, There is one migrate_from_qemu label set on this patch

This patch is migrated from qemu side, so except the libvirt define xml part , other parts are just copying from qemu side, So Scrum team decide we don't need to review it too detail and focus on libvirt part, Thanks all

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