Skip directories within ~/.ssh/config.d

[jacopo-exact]

close #784

Only parse files within the ~/.ssh/config.d directory, ignoring subdirectories. This conforms to the behaviour of ssh implementations that ignore config.d subdirs.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 99.83%. Comparing base (fab96ac) to head (3ed371a).
⚠️ Report is 155 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #785      +/-   ##
===========================================
- Coverage    99.85%   99.83%   -0.02%     
===========================================
  Files           95      100       +5     
  Lines        27784    31542    +3758     
  Branches      2908     3036     +128     
===========================================
+ Hits         27743    31491    +3748     
- Misses          38       45       +7     
- Partials         3        6       +3     

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