smb: new smbclient() features

[gpotter2]

• add a tree command to smbclient
• add a server function to list the connected sessions and IPs
• minor fixes to CLIUtil and AutoArgParse

[codecov]

Codecov Report

❌ Patch coverage is 21.78218% with 79 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.28%. Comparing base (dcf69ed) to head (2f099a6).

Files with missing lines	Patch %	Lines
scapy/layers/smbclient.py	23.15%	73 Missing ⚠️
scapy/utils.py	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4997      +/-   ##
==========================================
- Coverage   80.29%   80.28%   -0.01%     
==========================================
  Files         383      383              
  Lines       94739    95149     +410     
==========================================
+ Hits        76067    76395     +328     
- Misses      18672    18754      +82     

Files with missing lines	Coverage Δ
scapy/layers/msrpce/raw/ms_srvs.py	100.00% <ø> (ø)
scapy/layers/windows/erref.py	100.00% <ø> (ø)
scapy/utils.py	72.19% <0.00%> (-0.15%)	⬇️
scapy/layers/smbclient.py	69.52% <23.15%> (-5.70%)	⬇️

... and 5 files with indirect coverage changes

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