fix: add cap on max allowed port in network init

[imatiach-msft]

resolves issue #719

[imatiach-msft]

/azp run

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Azure Pipelines successfully started running 1 pipeline(s).

[codecov]

Codecov Report

Merging #759 into master will decrease coverage by 0.01%.
The diff coverage is 60%.

@@            Coverage Diff             @@
##           master     #759      +/-   ##
==========================================
- Coverage   80.14%   80.13%   -0.02%     
==========================================
  Files         230      230              
  Lines        9222     9227       +5     
  Branches      515      490      -25     
==========================================
+ Hits         7391     7394       +3     
- Misses       1831     1833       +2

Impacted Files	Coverage Δ
...icrosoft/ml/spark/lightgbm/LightGBMConstants.scala	100% <100%> (ø)	⬆️
...a/com/microsoft/ml/spark/lightgbm/TrainUtils.scala	90.27% <50%> (-0.76%)	⬇️
...osoft/ml/spark/io/http/PartitionConsolidator.scala	93.33% <0%> (-2.23%)	⬇️
.../execution/streaming/continuous/HTTPSourceV2.scala	93.4% <0%> (+0.36%)	⬆️

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[mhamilton723]

/azp run

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Azure Pipelines successfully started running 1 pipeline(s).