tcp/udp/dtls: cancel connection context before shutdown

[jkralik]

No description provided.

[codecov-commenter]

Codecov Report

Merging #319 (a041501) into master (30f28f6) will increase coverage by 0.12%.
The diff coverage is 88.88%.

@@            Coverage Diff             @@
##           master     #319      +/-   ##
==========================================
+ Coverage   68.99%   69.11%   +0.12%     
==========================================
  Files          67       67              
  Lines        5561     5560       -1     
==========================================
+ Hits         3837     3843       +6     
+ Misses       1323     1318       -5     
+ Partials      401      399       -2     

Impacted Files	Coverage Δ
udp/server.go	83.17% <50.00%> (+0.07%)	⬆️
dtls/session.go	84.28% <100.00%> (+2.95%)	⬆️
tcp/session.go	70.45% <100.00%> (-0.68%)	⬇️
udp/session.go	82.14% <100.00%> (-0.62%)	⬇️
udp/client/mutexmap.go	85.71% <0.00%> (-1.79%)	⬇️
udp/client/clientconn.go	71.77% <0.00%> (+0.47%)	⬆️
tcp/clientobserve.go	67.22% <0.00%> (+0.84%)	⬆️
udp/client/container.go	93.54% <0.00%> (+0.95%)	⬆️
... and 1 more

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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

100.0% Coverage
22.2% Duplication