dperf: a high performance open source l4lb load tester

Dperf (https://github.com/baidu/dperf) is a DPDK based high performance L4L7 load tester. It can generate huge traffic with a single x86 server: tens of millions of HTTP CPS，hundreds of Gbps throughput and billions of connections.
I hope it's useful for you. thanks.

The issue only links to the external dperf project and describes its capabilities; it does not identify a file, entry point, or requested change in glb-director. First confirm whether an integration or other action is intended, then define the affected area and acceptance criteria before implementation.

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