DCE/RPC tests for RPC

[gpotter2]

• minor bug fix with NCACN_NP HOST being not set
• pretty big padding bug with the trailing gap of deported conformant arrays embedded in structures. I read the documentation too quickly but man is this complicated...
• move msrpce tests + add new ones
• some string fields had their \x00 eaten by the bad padding :(
• add scapy-rpc UTS config

[codecov]

Codecov Report

❌ Patch coverage is 94.44444% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.86%. Comparing base (548c7eb) to head (81a689e).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
scapy/layers/dcerpc.py	87.50%	2 Missing ⚠️
scapy/tools/UTscapy.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4910      +/-   ##
==========================================
+ Coverage   80.84%   80.86%   +0.01%     
==========================================
  Files         369      369              
  Lines       90984    91024      +40     
==========================================
+ Hits        73560    73606      +46     
+ Misses      17424    17418       -6     

Files with missing lines	Coverage Δ
scapy/layers/msrpce/msdcom.py	36.32% <ø> (ø)
scapy/layers/msrpce/raw/ept.py	100.00% <100.00%> (ø)
scapy/layers/msrpce/raw/ms_dcom.py	100.00% <100.00%> (ø)
scapy/layers/msrpce/raw/ms_nrpc.py	100.00% <ø> (ø)
scapy/layers/msrpce/rpcclient.py	57.34% <100.00%> (+0.14%)	⬆️
scapy/tools/UTscapy.py	65.11% <75.00%> (+0.05%)	⬆️
scapy/layers/dcerpc.py	90.02% <87.50%> (-0.08%)	⬇️

... and 11 files with indirect coverage changes

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