Server session fix

[compscidr]

Found a bug where the server would stop listening after there were no Tcp sessions for a client because we would shut down the proxy session. This is intended, however, when a subsequent sesssion would start, it would still find the old session in the servers proxy session table, and it would no longer be running.

The solution was, once the proxy session has ended, to remove it from the servers proxy session table.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 62.36%. Comparing base (3c36c1c) to head (1dd7c69).
Report is 6 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main      #48      +/-   ##
============================================
+ Coverage     62.11%   62.36%   +0.24%     
- Complexity      215      218       +3     
============================================
  Files            15       15              
  Lines          1903     1897       -6     
  Branches        283      283              
============================================
+ Hits           1182     1183       +1     
+ Misses          556      551       -5     
+ Partials        165      163       -2     

Flag	Coverage Δ
libunittests	62.36% <ø> (+0.24%)	⬆️

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