Minor SMB and kerberos improvements

[gpotter2]

• minor smb improvements (properly reset the session when a bad password is given)
• minor kerb improvements (add kkdcp)

[codecov]

Codecov Report

Attention: Patch coverage is 54.54545% with 5 lines in your changes missing coverage. Please review.

Project coverage is 81.62%. Comparing base (45de3db) to head (9ee7426).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
scapy/layers/kerberos.py	60.00%	4 Missing ⚠️
scapy/layers/smbclient.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4597      +/-   ##
==========================================
- Coverage   81.62%   81.62%   -0.01%     
==========================================
  Files         358      358              
  Lines       85654    85665      +11     
==========================================
+ Hits        69916    69923       +7     
- Misses      15738    15742       +4     

Files with missing lines	Coverage Δ
scapy/layers/smbclient.py	74.25% <0.00%> (-0.10%)	⬇️
scapy/layers/kerberos.py	66.23% <60.00%> (-0.05%)	⬇️

... and 5 files with indirect coverage changes

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