DCE/RPC: various fixes

[gpotter2]

This PR does a bunch of things related to DCE/RPC:

• fixes Problem in DCERPC implementation #4900 by properly taking the association group id into account when computing the call_id. (BTW, contrary to what C706 says, it seems the group is also taken into account when using alter context, at least on windows)
• also register the names of [MS-DCOM] interfaces to have them shown nicely in OBJREF
• improve handling of impersonation type, also properly propagates it for NTLM
• generally a better and more per-spec handling of SPNs when it comes to DCOM
• fix the security trailer version being wrong which would lead in ACCESS_DENIED

[codecov]

Codecov Report

❌ Patch coverage is 48.83721% with 22 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.27%. Comparing base (9802dca) to head (86c5fc4).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
scapy/layers/msrpce/msdcom.py	5.88%	16 Missing ⚠️
scapy/layers/msrpce/rpcclient.py	72.72%	3 Missing ⚠️
scapy/layers/msrpce/msnrpc.py	0.00%	2 Missing ⚠️
scapy/layers/dcerpc.py	92.30%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4941      +/-   ##
==========================================
- Coverage   80.28%   80.27%   -0.02%     
==========================================
  Files         375      375              
  Lines       92410    92431      +21     
==========================================
+ Hits        74194    74201       +7     
- Misses      18216    18230      +14     

Files with missing lines	Coverage Δ
scapy/layers/ms_nrtp.py	81.78% <ø> (ø)
scapy/layers/msrpce/rpcserver.py	87.23% <ø> (+1.59%)	⬆️
scapy/layers/ntlm.py	81.32% <ø> (ø)
scapy/layers/dcerpc.py	90.64% <92.30%> (+0.05%)	⬆️
scapy/layers/msrpce/msnrpc.py	64.24% <0.00%> (-0.20%)	⬇️
scapy/layers/msrpce/rpcclient.py	57.58% <72.72%> (ø)
scapy/layers/msrpce/msdcom.py	35.57% <5.88%> (-0.76%)	⬇️

... and 5 files with indirect coverage changes

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