netperf: stop tcpdump process during performance testing
This patch was wrongly dropped in original refactor. Tcpdump brings extra latency, it causes the guest to batch more bytes per packet. We should stop tcpdump to drop the effect, it will be restarted at the beginning of next case. Reported-by: NWenli Quan <wquan@redhat.com> Signed-off-by: NAmos Kong <akong@redhat.com> Acked-by: NWenli Quan <wquan@redhat.com>
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