Simplify getting the sshd server host keys.

[s0undt3ch]

Fixes #176

[codecov]

Codecov Report

Attention: Patch coverage is 75.86207% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 85.27%. Comparing base (1ffc762) to head (2f87ee9).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #177      +/-   ##
==========================================
- Coverage   85.39%   85.27%   -0.12%     
==========================================
  Files          97       97              
  Lines        5960     5977      +17     
  Branches      633      636       +3     
==========================================
+ Hits         5089     5096       +7     
- Misses        699      705       +6     
- Partials      172      176       +4     

Flag	Coverage Δ
Linux	84.71% <75.87%> (-0.09%)	⬇️
Windows	76.37% <27.59%> (-0.13%)	⬇️
macOS	75.06% <27.59%> (-0.13%)	⬇️
py3.10	84.93% <75.87%> (-0.07%)	⬇️
py3.7	84.01% <74.08%> (-0.09%)	⬇️
py3.8	84.85% <75.87%> (-0.09%)	⬇️
py3.9	85.00% <75.87%> (-0.09%)	⬇️
pytest-7.3.0	?
pytest-7.4.0	84.98% <75.87%> (-0.09%)	⬇️
pytest-8.0.0	84.31% <75.87%> (?)
pytest-8.0.0rc2	?
pytest-8.1.0	84.31% <75.87%> (?)
salt-3005.0	?
salt-3006.0	84.98% <75.87%> (-0.07%)	⬇️
salt-3007.0	84.80% <75.87%> (?)
src	77.28% <63.16%> (-0.07%)	⬇️
tests	96.36% <100.00%> (-0.04%)	⬇️

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

Files	Coverage Δ
src/saltfactories/plugins/__init__.py	85.72% <ø> (ø)
...integration/factories/daemons/ssh/test_salt_ssh.py	100.00% <100.00%> (ø)
...ts/integration/factories/daemons/sshd/test_sshd.py	100.00% <100.00%> (ø)
src/saltfactories/daemons/sshd.py	76.63% <63.16%> (-1.89%)	⬇️

... and 2 files with indirect coverage changes