network: add ability to specify port for P2P version exchange

[AnnaShaleva]

Close #1868

[codecov]

Codecov Report

Merging #1942 (09bb162) into master (5924123) will increase coverage by 0.06%.
The diff coverage is 33.33%.

@@            Coverage Diff             @@
##           master    #1942      +/-   ##
==========================================
+ Coverage   82.92%   82.98%   +0.06%     
==========================================
  Files         289      289              
  Lines       22883    22960      +77     
==========================================
+ Hits        18975    19054      +79     
+ Misses       2713     2705       -8     
- Partials     1195     1201       +6     

Impacted Files	Coverage Δ
pkg/network/server.go	70.58% <0.00%> (-0.21%)	⬇️
pkg/network/server_config.go	100.00% <100.00%> (ø)
pkg/core/interops.go	100.00% <0.00%> (ø)
pkg/interop/native/gas/gas.go	0.00% <0.00%> (ø)
pkg/interop/runtime/runtime.go	0.00% <0.00%> (ø)
pkg/core/interop/runtime/engine.go	100.00% <0.00%> (ø)
pkg/services/notary/notary.go	92.46% <0.00%> (+1.00%)	⬆️
pkg/services/oracle/request.go	53.23% <0.00%> (+5.75%)	⬆️
pkg/core/native/native_gas.go	77.01% <0.00%> (+8.38%)	⬆️
pkg/services/oracle/oracle.go	90.90% <0.00%> (+11.36%)	⬆️

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