add a config option to disable sending of Version Negotiation packets

[marten-seemann]

See libp2p/go-libp2p#1433 for context.

[codecov]

Codecov Report

Merging #3216 (3a35902) into master (e9d12b7) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #3216   +/-   ##
=======================================
  Coverage   85.40%   85.41%           
=======================================
  Files         134      134           
  Lines        9825     9827    +2     
=======================================
+ Hits         8391     8393    +2     
  Misses       1060     1060           
  Partials      374      374           

Impacted Files	Coverage Δ
config.go	100.00% <100.00%> (ø)
server.go	80.46% <100.00%> (+0.06%)	⬆️

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