Small HTTP session fixes

[gpotter2]

• HTTP 1.0: support HEAD #4307 is broken. Revert it and find some similar, still shitty workaround
• fix HTTP url being badly parsed in HTTP_Client
• I don't know why it's here, but also includes a fix of Limited broadcast... (lost stash or something)

[codecov]

Codecov Report

Attention: Patch coverage is 94.73684% with 1 line in your changes missing coverage. Please review.

Project coverage is 81.62%. Comparing base (07854ab) to head (9704bcf).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
scapy/layers/l2.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4601   +/-   ##
=======================================
  Coverage   81.62%   81.62%           
=======================================
  Files         358      358           
  Lines       85674    85678    +4     
=======================================
+ Hits        69929    69937    +8     
+ Misses      15745    15741    -4     

Files with missing lines	Coverage Δ
scapy/layers/http.py	82.77% <100.00%> (+0.33%)	⬆️
scapy/sessions.py	93.54% <100.00%> (+0.06%)	⬆️
scapy/layers/l2.py	83.75% <50.00%> (-0.14%)	⬇️

... and 7 files with indirect coverage changes