Unify `packets_limit_per_flow` and `max_packets_per_flow_to_process`

[utoni]

Right now nDPId has a configuration parameter max_packets_per_flow_to_process which controls how many packets should be handed over to libnDPI for processing.
But libnDPI has it's own parameter named packets_limit_per_flow which also controls how many packets should be processed.

AC: nDPId should query packets_limit_per_flow and use that value as replacement for max_packets_per_flow_to_process .

[torres-miguel]

I am working on an first issue on the related project ndpi. May I try to take on this as well to understand these more in depth?

[utoni]

Sure. At first, please read the documentation of packets_limit_per_flow in: https://github.com/ntop/nDPI/blob/dev/doc/configuration_parameters.md

The implementation into nDPId is a bit more sophisticated. There are multiple ways to solve it. I guess you could either use a global, which reads the value of packets_limit_per_flow once during startup/after-config-file-reading and use it as replacement of max_packets_per_flow_to_process.

Instead of using a global, you could also add it as member to the nDPId_workflow.