tcp_conn_tuner: notice retransmit events for tcp conn, apply BBR #129
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....if these exceed 1/32 of packets sent. Also only apply RL techniques for connections we repeatedly use; this saves us trying to apply RL to cases where we do not have enough data to make good choices.
Add file download test using python3 http.server; it allows us to show BBR kicking in for connections where loss/latency are induced via netem.