Traffic prioritization on per-connection basis

[laperie]

It should be possible to set a flag on per-connection basis that would indicate the priority of the outgoing traffic. In the stack, the outgoing traffic of he higher priority has to be delivered to a network adapter before traffic with the lower priority

[tbursztyka]

I don't need to be assigned to that. Actually, the work is mostly done already in one of Jukka's PR