Fix BBR probe UP and Probe RTT #1670
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Make sure that the BBR code does not remain in the "ProbeBW_UP" state is the measured RTT is too high.
Fix the implementation of BBR "ProbeRTT".
Add test "mediatest_video2_down" to verify behavior when the bandwidth suddenly drops from 10 Mbps to 10. The "ProbeBW_UP" fix ensures that after noticing the drop the measure RTT stays at a low value. There is still work needed to ensure that the bandwidth drop is noticed faster.