Reworked uhyve output

[jounathaen]

• Removed -v/--verbose flag to fix Uhyve doesn't halt when not run with -v #496
• Add output capture mechanism. resolves Catch output from kernel #528

[n0toose]

Note: Freeing up -v means that we'll be able to use this parameter for #796.

[codecov]

Codecov Report

Attention: Patch coverage is 72.03390% with 33 lines in your changes missing coverage. Please review.

Project coverage is 66.82%. Comparing base (b322724) to head (6111373).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
src/vm.rs	65.90%	15 Missing ⚠️
src/hypercall.rs	78.12%	7 Missing ⚠️
src/bin/uhyve.rs	0.00%	5 Missing ⚠️
src/params.rs	44.44%	5 Missing ⚠️
src/linux/mod.rs	92.85%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #796      +/-   ##
==========================================
- Coverage   66.83%   66.82%   -0.02%     
==========================================
  Files          19       19              
  Lines        2503     2568      +65     
==========================================
+ Hits         1673     1716      +43     
- Misses        830      852      +22     

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