HTTP_Client/Server doc, other minor win tweaks

[gpotter2]

• HTTP_Client / HTTP_Server documentation
• tiny fix in http tests for OSX
• sort arping results in order (minor)
• add latest Kerberos structures, minor improvements to the client

[codecov]

Codecov Report

Attention: Patch coverage is 78.37838% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 81.55%. Comparing base (8461c2e) to head (2ad413e).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4393      +/-   ##
==========================================
- Coverage   81.56%   81.55%   -0.01%     
==========================================
  Files         352      352              
  Lines       83897    83920      +23     
==========================================
+ Hits        68431    68443      +12     
- Misses      15466    15477      +11     

Files	Coverage Δ
scapy/layers/l2.py	84.32% <100.00%> (-0.10%)	⬇️
scapy/asn1/asn1.py	86.91% <50.00%> (-0.18%)	⬇️
scapy/asn1fields.py	83.47% <81.81%> (-0.01%)	⬇️
scapy/layers/kerberos.py	67.96% <76.19%> (+0.13%)	⬆️

... and 2 files with indirect coverage changes

[gpotter2]

Merging to fix those pesky http tests :(