Windows: add Kerberos PKINIT, Netlogon's Kerberos secure channel, better NTLM variants

[gpotter2]

• add CMS signing / check
• refactor (a lot) scapy/layers/tls/cert.py add add documentation
  • Chain wasn't as useful as it could be. We now have a CertTree class that serves as a certificate store (think like Windows), and properly links certificates against their issuer, to a list of root CAs
  • getchain() allows to find a chain of certificates towards one
  • verify() says if a certificate can be verified against the store
• support PKINIT in Kerberos
• Load KRB5CCNAME in SPNEGO.from_cli_arguments
• fix Kerberos handling in DCE/RPC passive sniffing
• improve Kerberos handling of the "DELEGATION"-related structures
• Improve DCE/RPC context handling (keeps the context IDs when re-binding to the same interface, etc.)
• Add support for Kerberos secure channels in MS-NRPC
• Add the ability to chose between WindowsNT, Windows2000 and Windows2003+ variants of NTLM when building packets
• add an ability to NOT send channel bindings in HTTP

[codecov[bot]]

Codecov Report

:x: Patch coverage is 66.04803% with 311 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 80.81%. Comparing base (e73137e) to head (ed7f1f1).

Files with missing lines	Patch %	Lines
scapy/layers/kerberos.py	28.57%	130 Missing :warning:
scapy/layers/tls/cert.py	77.88%	48 Missing :warning:
scapy/layers/msrpce/msnrpc.py	19.60%	41 Missing :warning:
scapy/layers/ntlm.py	67.92%	34 Missing :warning:
scapy/layers/spnego.py	87.44%	28 Missing :warning:
scapy/layers/msrpce/rpcclient.py	50.00%	24 Missing :warning:
scapy/layers/gssapi.py	87.50%	2 Missing :warning:
scapy/libs/rfc3961.py	81.81%	2 Missing :warning:
scapy/asn1fields.py	88.88%	1 Missing :warning:
scapy/layers/smb2.py	66.66%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4879      +/-   ##
==========================================
- Coverage   80.86%   80.81%   -0.05%     
==========================================
  Files         368      368              
  Lines       90271    90636     +365     
==========================================
+ Hits        72996    73250     +254     
- Misses      17275    17386     +111     

Files with missing lines	Coverage Δ
scapy/asn1/mib.py	91.66% <100.00%> (+0.05%)	:arrow_up:
scapy/layers/dcerpc.py	90.10% <100.00%> (+0.04%)	:arrow_up:
scapy/layers/http.py	83.68% <100.00%> (+0.02%)	:arrow_up:
scapy/layers/ldap.py	67.11% <ø> (+0.12%)	:arrow_up:
scapy/layers/msrpce/rpcserver.py	89.14% <ø> (ø)
scapy/layers/smb.py	76.70% <ø> (-0.36%)	:arrow_down:
scapy/layers/smbclient.py	73.05% <100.00%> (ø)
scapy/layers/smbserver.py	72.78% <ø> (ø)
scapy/layers/x509.py	97.95% <100.00%> (+0.39%)	:arrow_up:
scapy/modules/ticketer.py	41.64% <100.00%> (+0.49%)	:arrow_up:
... and 10 more

... and 6 files with indirect coverage changes

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