sFlow with OVS

1. create Ubuntu20.04 VMs  qemu-img create ubuntu2004-svr-0.img 40G -f raw qemu-img create ubuntu2004-svr-1.img 40G -f raw qemu-system-x86_64 -enable-kvm -smp 8 -hda ubuntu2004-svr-0.img -m 8G -boot d

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