Remove Host::setup()

[stevenengler]

I wanted to move around some of the host's network objects, but it was a little complicated with the setup() function, so I moved the code from the Host::setup() into Host::new(). Hopefully this doesn't overlap with any other WIP changes.

[codecov]

Codecov Report

Base: 65.90% // Head: 67.68% // Increases project coverage by +1.77% 🎉

Coverage data is based on head (d0bb8d9) compared to base (270148c).
Patch coverage: 91.83% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2606      +/-   ##
==========================================
+ Coverage   65.90%   67.68%   +1.77%     
==========================================
  Files         198      198              
  Lines       29192    29180      -12     
  Branches     5740     5739       -1     
==========================================
+ Hits        19240    19750     +510     
+ Misses       5420     4858     -562     
- Partials     4532     4572      +40     

Flag	Coverage Δ
tests	67.68% <91.83%> (+1.77%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/main/host/host.rs	81.41% <91.66%> (+0.46%)	⬆️
src/main/core/manager.rs	63.47% <100.00%> (+0.14%)	⬆️
src/main/host/syscall/handler/random.rs	47.61% <0.00%> (-4.77%)	⬇️
...c/main/utility/synchronization/count_down_latch.rs	85.10% <0.00%> (-0.54%)	⬇️
src/main/host/syscall/handler/socket.rs	66.02% <0.00%> (-0.22%)	⬇️
src/main/utility/byte_queue.rs	56.32% <0.00%> (ø)
src/main/utility/childpid_watcher.rs	69.73% <0.00%> (+0.32%)	⬆️
src/main/host/descriptor/socket/unix.rs	68.15% <0.00%> (+0.34%)	⬆️
src/main/core/support/units.rs	56.36% <0.00%> (+0.51%)	⬆️
... and 27 more

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[sporksmith]

🎉