Use Path instead of PathBuf on getters

[mkroening]

No description provided.

[codecov]

Codecov Report

Merging #187 (74c3216) into master (f66738f) will not change coverage.
The diff coverage is 40.00%.

@@           Coverage Diff           @@
##           master     #187   +/-   ##
=======================================
  Coverage   30.76%   30.76%           
=======================================
  Files          16       16           
  Lines        4018     4018           
=======================================
  Hits         1236     1236           
  Misses       2782     2782           

Impacted Files	Coverage Δ
src/linux/vcpu.rs	0.00% <0.00%> (ø)
src/vm.rs	28.35% <0.00%> (ø)
src/linux/uhyve.rs	53.77% <100.00%> (ø)

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[stlankes]

bors r+

[bors]

Build succeeded:

• Build (macos-latest)
• Build (ubuntu-latest)
• Cargo tests (macos-latest)
• Cargo tests (ubuntu-latest)
• Clippy
• Format
• KVM Tests
• Rusty-Hermit Kernel based integration tests