Support DMSA in Kerberos tgs_req

[gpotter2]

• add DMSA support in Kerberos
• parse Kerberos "crypto agility" error

Sorry everyone I currently have very little time to review PRs :(

[codecov]

Codecov Report

Attention: Patch coverage is 30.00000% with 14 lines in your changes missing coverage. Please review.

Project coverage is 82.20%. Comparing base (d7ce0e4) to head (059b3a2).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
scapy/layers/kerberos.py	26.31%	14 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4746      +/-   ##
==========================================
- Coverage   82.20%   82.20%   -0.01%     
==========================================
  Files         361      361              
  Lines       87177    87210      +33     
==========================================
+ Hits        71668    71689      +21     
- Misses      15509    15521      +12     

Files with missing lines	Coverage Δ
scapy/libs/rfc3961.py	85.84% <100.00%> (+0.02%)	⬆️
scapy/layers/kerberos.py	61.13% <26.31%> (-0.23%)	⬇️

... and 11 files with indirect coverage changes

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