DCE/RPC - Add more testing

[gpotter2]

• add more tests to DCE/RPC
• fix NTLM server checking of username
• minor smbclient fix
• improve endpoint mapper resilliency

[codecov]

Codecov Report

❌ Patch coverage is 5.55556% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.23%. Comparing base (ded1d73) to head (4ed1329).

Files with missing lines	Patch %	Lines
scapy/layers/msrpce/rpcclient.py	0.00%	8 Missing ⚠️
scapy/layers/ntlm.py	0.00%	5 Missing ⚠️
scapy/config.py	0.00%	4 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (ded1d73) and HEAD (4ed1329). Click for more details.

HEAD has 9 uploads less than BASE

Flag	BASE (ded1d73)	HEAD (4ed1329)
	11	2

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #4921       +/-   ##
===========================================
- Coverage   80.10%   48.23%   -31.87%     
===========================================
  Files         370      352       -18     
  Lines       91727    91402      -325     
===========================================
- Hits        73477    44089    -29388     
- Misses      18250    47313    +29063     

Files with missing lines	Coverage Δ
scapy/layers/smbclient.py	22.07% <100.00%> (-52.32%)	⬇️
scapy/config.py	63.26% <0.00%> (-15.16%)	⬇️
scapy/layers/ntlm.py	24.93% <0.00%> (-56.35%)	⬇️
scapy/layers/msrpce/rpcclient.py	11.22% <0.00%> (-46.12%)	⬇️

... and 318 files with indirect coverage changes

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