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[WIP] cc: BBRv2 congestion control module
This PR is implementing BBR v2 congestion control algorithm specified in draft-cardwell-iccrg-bbr-congestion-control-02, based on #1180.
Mostly as-is translation of the draft, might be buggy and not well tested. Also it need some additional change on the recovery and rate estimatino module included in this PR.
If you look for more stable bbr, see #1180 first.
- [ ] more test under various network conditions
- [ ] write unit tests
- [ ] split recovery module changes into a separate PRs.