The app will calculate and output used CPU time for flow insertion rate.
It's also needed for some new insertion items, such as meter.
It's better to split this calculation and output part to a single function,
so that all new insertion items can use it.
Signed-off-by: Dong Zhou <dongzhou@nvidia.com>
Reviewed-by: Wisam Jaddo <wisamm@nvidia.com>
Reviewed-by: Alexander Kozyrev <akozyrev@nvidia.com>
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