Small log improvements

[JSCU-CNI]

This PR addresses two small issues:

• The hash record modifier could generate a lot of warnings when combining the walkfs plugin with --hash as a lot of files can be broken. this log is now demoted to INFO for FileNotFoundErrors as that exception is not really interesting in those instances.
• When entering a child target using --children or target-shell's enter the path of said child was appended to the locations of where to look for targetcfg files. That obviously does not work as that path is virtual inside the main target. This is now fixed.

Fixes #880 and fixes #881.

[EinatFox]

Hi @JSCU-CNI , please open an issue and attache this PR so we can schedule a review into our sprints.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.70%. Comparing base (ebd38fe) to head (fead052).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #857   +/-   ##
=======================================
  Coverage   76.70%   76.70%           
=======================================
  Files         315      315           
  Lines       27033    27039    +6     
=======================================
+ Hits        20735    20741    +6     
  Misses       6298     6298           

Flag	Coverage Δ
unittests	76.70% <100.00%> (+<0.01%)	⬆️

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