Replace Grizzly HTTP Server with Java HTTP Server

[exceptionfactory]

This pull request replaces the Grizzly HTTP Server dependency with the standard Java HttpServer for port forwarding unit tests.

The Java HttpServer is part of the standard JDK since Java 1.6 and requires no external dependencies.

[hierynomus]

Jikes... com.sun.net... As far as I remember, wasn't it an antipattern to depend on anything in com.sun as this is not guaranteed to be present in other JVMs.

[hierynomus]

Scratch that, I've read up on it... Seems that I'm confusing sun.* and com.sun.*... Nothing to see here, thanks for the PR

[exceptionfactory]

Thanks for reviewing and merging @hierynomus! Yes, the package name for the JDK HttpServer causes a natural double take, so thanks for giving it a closer look, as it is part of the public JDK.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.54%. Comparing base (27bf52e) to head (3a91195).
Report is 6 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1010      +/-   ##
============================================
+ Coverage     69.75%   70.54%   +0.78%     
- Complexity     1501     1544      +43     
============================================
  Files           214      215       +1     
  Lines          7681     7914     +233     
  Branches        663      682      +19     
============================================
+ Hits           5358     5583     +225     
+ Misses         1979     1977       -2     
- Partials        344      354      +10     

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