Code cleanup

[guedou]

Following our discussions, here is a PR doing some code cleanup.

[codecov]

Codecov Report

❌ Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 80.88%. Comparing base (3363981) to head (ecf94bd).
⚠️ Report is 17 commits behind head on master.

Files with missing lines	Patch %	Lines
scapy/main.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4854      +/-   ##
==========================================
- Coverage   80.90%   80.88%   -0.03%     
==========================================
  Files         366      368       +2     
  Lines       90140    90217      +77     
==========================================
+ Hits        72931    72973      +42     
- Misses      17209    17244      +35     

Files with missing lines	Coverage Δ
scapy/data.py	90.95% <100.00%> (+0.12%)	⬆️
scapy/utils.py	73.38% <ø> (-0.12%)	⬇️
scapy/main.py	67.76% <83.33%> (-1.60%)	⬇️

... and 25 files with indirect coverage changes

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