WinSSP: support Encryption, fix DCE/RPC SMB IO

[gpotter2]

• improve support of NCACN_NP, most notably send() did not work (sr1 did)
• add support for Encryption/Decryption/Signatures and channel binding in WinSSP
• minor logging changes

[codecov]

Codecov Report

❌ Patch coverage is 44.64286% with 93 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.22%. Comparing base (cdc199a) to head (f841c62).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
scapy/arch/windows/sspi.py	45.31%	70 Missing ⚠️
scapy/layers/ldap.py	10.00%	9 Missing ⚠️
scapy/layers/spnego.py	42.85%	4 Missing ⚠️
scapy/utils.py	0.00%	3 Missing ⚠️
scapy/layers/msrpce/rpcclient.py	60.00%	2 Missing ⚠️
scapy/modules/ldaphero.py	0.00%	2 Missing ⚠️
scapy/tools/UTscapy.py	0.00%	2 Missing ⚠️
scapy/layers/smbclient.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4978      +/-   ##
==========================================
- Coverage   80.27%   80.22%   -0.05%     
==========================================
  Files         382      382              
  Lines       93996    94124     +128     
==========================================
+ Hits        75452    75510      +58     
- Misses      18544    18614      +70     

Files with missing lines	Coverage Δ
scapy/layers/dcerpc.py	90.66% <100.00%> (+0.01%)	⬆️
scapy/layers/windows/erref.py	100.00% <ø> (ø)
scapy/sendrecv.py	86.51% <100.00%> (+0.01%)	⬆️
scapy/layers/smbclient.py	75.21% <80.00%> (-0.07%)	⬇️
scapy/layers/msrpce/rpcclient.py	57.82% <60.00%> (-0.11%)	⬇️
scapy/modules/ldaphero.py	0.00% <0.00%> (ø)
scapy/tools/UTscapy.py	65.37% <0.00%> (ø)
scapy/utils.py	72.33% <0.00%> (-0.08%)	⬇️
scapy/layers/spnego.py	83.10% <42.85%> (-0.70%)	⬇️
scapy/layers/ldap.py	66.82% <10.00%> (-0.21%)	⬇️
... and 1 more

... and 5 files with indirect coverage changes

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