Include port in X-Forwarded-Host header if not default

[jwgmeligmeyling]

Fixes #122.

After looking into it a bit better the resources are quite contradicting each other on whether the port should be in the header or not.

Perhaps we could at least make the behaviour configurable to support both flavors?

[codecov-commenter]

Codecov Report

Merging #124 (fae1a4b) into master (f6311c9) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master     #124   +/-   ##
=========================================
  Coverage     90.80%   90.81%           
  Complexity      542      542           
=========================================
  Files           167      167           
  Lines          1849     1851    +2     
  Branches         54       55    +1     
=========================================
+ Hits           1679     1681    +2     
  Misses          148      148           
  Partials         22       22           

Impacted Files	Coverage Δ
...ors/rewrite/CommonRequestProxyHeadersRewriter.java	95.83% <100.00%> (+0.37%)	⬆️

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