DCE/RPC & Kerberos fixes

[gpotter2]

• improve naming of DCE/RPC pointer fields
• improve Kerberos server handling (in DCE/RPC mode and passive)
• minor fixes to UTScapy
• new "MS-EERR" implementation
• fixes to DCE/RPC default detection (most notably, epmapper)
• recompile the included layers now that midl-to-scapy is public

[codecov]

Codecov Report

Attention: Patch coverage is 97.24771% with 9 lines in your changes missing coverage. Please review.

Project coverage is 81.28%. Comparing base (bd7f2a3) to head (bff733f).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
scapy/tools/UTscapy.py	25.00%	3 Missing ⚠️
scapy/layers/dcerpc.py	91.30%	2 Missing ⚠️
scapy/layers/kerberos.py	83.33%	2 Missing ⚠️
scapy/layers/spnego.py	50.00%	1 Missing ⚠️
scapy/main.py	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4783      +/-   ##
==========================================
+ Coverage   81.23%   81.28%   +0.05%     
==========================================
  Files         363      364       +1     
  Lines       88404    88691     +287     
==========================================
+ Hits        71811    72096     +285     
- Misses      16593    16595       +2     

Files with missing lines	Coverage Δ
scapy/layers/msrpce/all.py	88.23% <ø> (ø)
scapy/layers/msrpce/msdcom.py	69.56% <ø> (ø)
scapy/layers/msrpce/mseerr.py	100.00% <100.00%> (ø)
scapy/layers/msrpce/mspac.py	89.76% <ø> (ø)
scapy/layers/msrpce/raw/ept.py	100.00% <100.00%> (ø)
scapy/layers/msrpce/raw/ms_dcom.py	100.00% <ø> (ø)
scapy/layers/msrpce/raw/ms_drsr.py	100.00% <ø> (ø)
scapy/layers/msrpce/raw/ms_nrpc.py	100.00% <ø> (ø)
scapy/layers/msrpce/raw/ms_samr.py	100.00% <ø> (ø)
scapy/layers/msrpce/raw/ms_srvs.py	100.00% <100.00%> (ø)
... and 8 more

... and 7 files with indirect coverage changes

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