Add iperf3 support to nfv-test-api

Add support to nfv test api to:

start an iperf server iperf3 -s
run a test with: destination, speed and protocol (TCP or udp). In case of TCP speed can be optional

Report the results. iperf has json output support.

Edited Sep 09, 2024 by Bart Vanbrabant

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