fwdm: improve logging

[gpotter2]

• minor improvements to forwarding's machine logging
• fix missing check in AutoargParse

[codecov]

Codecov Report

❌ Patch coverage is 0% with 30 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.82%. Comparing base (1b96fcc) to head (bb0e55f).

Files with missing lines	Patch %	Lines
scapy/fwdmachine.py	0.00%	27 Missing ⚠️
scapy/utils.py	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5017      +/-   ##
==========================================
- Coverage   80.35%   79.82%   -0.53%     
==========================================
  Files         386      386              
  Lines       95996    96012      +16     
==========================================
- Hits        77137    76644     -493     
- Misses      18859    19368     +509     

Files with missing lines	Coverage Δ
scapy/utils.py	71.94% <0.00%> (-0.26%)	⬇️
scapy/fwdmachine.py	0.00% <0.00%> (ø)

... and 18 files with indirect coverage changes

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