Make RTO clear fast recovery

[JoTurk]

Description

Make RTO clear fast recovery.

Reference issue

part of pion/webrtc#3356

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.86%. Comparing base (91cdc67) to head (5743623).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #453      +/-   ##
==========================================
+ Coverage   83.81%   83.86%   +0.04%     
==========================================
  Files          52       52              
  Lines        4054     4060       +6     
==========================================
+ Hits         3398     3405       +7     
  Misses        479      479              
+ Partials      177      176       -1     

Flag	Coverage Δ
go	83.86% <100.00%> (+0.04%)	⬆️

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[philipch07]

That was quick. How does the output from SCP look?

[JoTurk]

That was quick. How does the output from SCP look?

we'll need to update it with this case and few others, I'll embed usrsctp soon, to catch more cases like this. I'll need to get it working with vnet first.

[JoTurk]

I added references to the specs.