handle Version Negotiation packets in the session

[marten-seemann]

Fixes #2639, fixes #2510.

[codecov]

Codecov Report

Merging #2640 into master will increase coverage by 0.19%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2640      +/-   ##
==========================================
+ Coverage   86.31%   86.50%   +0.19%     
==========================================
  Files         121      121              
  Lines        9771    10045     +274     
==========================================
+ Hits         8433     8689     +256     
- Misses        996     1017      +21     
+ Partials      342      339       -3     

Impacted Files	Coverage Δ
server.go	84.02% <ø> (+0.59%)	⬆️
client.go	73.24% <100.00%> (-5.05%)	⬇️
session.go	76.42% <100.00%> (+0.88%)	⬆️
internal/wire/transport_parameters.go	92.15% <0.00%> (+2.34%)	⬆️
internal/handshake/qtls.go	92.36% <0.00%> (+2.64%)	⬆️
internal/handshake/crypto_setup.go	71.64% <0.00%> (+5.11%)	⬆️
internal/handshake/unsafe.go	66.67% <0.00%> (+6.67%)	⬆️

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