Simplify port detection code

[ekohl]

This saves a few redundant variable assignments.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.87 🎉

Comparison is base (9a4e935) 84.74% compared to head (37d3811) 85.61%.

❗ Current head 37d3811 differs from pull request most recent head 53efa23. Consider uploading reports for the commit 53efa23 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #95      +/-   ##
==========================================
+ Coverage   84.74%   85.61%   +0.87%     
==========================================
  Files           1        1              
  Lines         295      292       -3     
==========================================
  Hits          250      250              
+ Misses         45       42       -3     

Impacted Files	Coverage Δ
lib/beaker/hypervisor/docker.rb	85.61% <0.00%> (+0.87%)	⬆️

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