Kerberos & WinSSP: support KDC pinning, begin delegation

[gpotter2]

• support KDC pinning on WinSSP. When testing in a CI environment with multiple KDCs, it allows to prevent replication races by always using the same DC
• begin work to add GSS_C_DELEG_FLAG

[codecov]

Codecov Report

❌ Patch coverage is 38.88889% with 55 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.29%. Comparing base (8c7ccdf) to head (68f66ad).

Files with missing lines	Patch %	Lines
scapy/arch/windows/sspi.py	38.09%	52 Missing ⚠️
scapy/modules/ticketer.py	50.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5028      +/-   ##
==========================================
- Coverage   80.34%   80.29%   -0.05%     
==========================================
  Files         386      386              
  Lines       96037    96127      +90     
==========================================
+ Hits        77158    77188      +30     
- Misses      18879    18939      +60     

Files with missing lines	Coverage Δ
scapy/modules/ticketer.py	46.30% <50.00%> (+0.02%)	⬆️
scapy/arch/windows/sspi.py	64.41% <38.09%> (-5.92%)	⬇️

... and 4 files with indirect coverage changes

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