Support stupid OSes

[gpotter2]

• restore support for OSes that do not support IPv6
• move banner generation into its own function (main.py), and add mini argument

[codecov]

Codecov Report

Merging #4155 (db58c41) into master (4fefbb0) will increase coverage by 0.01%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##           master    #4155      +/-   ##
==========================================
+ Coverage   81.76%   81.77%   +0.01%     
==========================================
  Files         330      330              
  Lines       76315    76328      +13     
==========================================
+ Hits        62399    62421      +22     
+ Misses      13916    13907       -9     

Files	Coverage Δ
scapy/layers/dns.py	86.89% <100.00%> (+0.06%)	⬆️
scapy/layers/hsrp.py	90.00% <100.00%> (+0.71%)	⬆️
scapy/layers/ntp.py	85.32% <ø> (-0.04%)	⬇️
scapy/utils.py	78.66% <100.00%> (+0.75%)	⬆️
scapy/config.py	83.02% <0.00%> (ø)
scapy/pton_ntop.py	86.84% <50.00%> (-2.05%)	⬇️
scapy/main.py	71.91% <77.77%> (+0.09%)	⬆️

... and 6 files with indirect coverage changes

[guedou]

What are these OSes?

[gpotter2]

What are these OSes?

Only the most ridiculous ones: https://gpotter2.github.io/secdev.github.io/?try=1