app/flow-perf: report first flow latency
app/flow-perf: report first flow latency

Starting from this commit the app will always
report the first flow latency.

This is useful in debugging to check the first
flow insertion before any caching effect.

Signed-off-by: Wisam Jaddo <cbdf453c8bf861f460ccde953a2ad4b2bcf4ed16@nvidia.com>
Acked-by: Alexander Kozyrev <a103889f73a7af0066377584f3d0eb32f9983c2e@nvidia.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk