Select interface in TFTP automatons

[gpotter2]

• add automatic interface selection on TFTP servers

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.14%. Comparing base (bff1ea0) to head (fb3e8fa).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4684      +/-   ##
==========================================
- Coverage   82.12%   81.14%   -0.98%     
==========================================
  Files         359      359              
  Lines       86630    86643      +13     
==========================================
- Hits        71141    70304     -837     
- Misses      15489    16339     +850     

Files with missing lines	Coverage Δ
scapy/layers/tftp.py	96.94% <100.00%> (+0.11%)	⬆️

... and 42 files with indirect coverage changes

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