SMB: support BUFFER_OVERFLOW and NTLM without TimeStamp

[gpotter2]

• fix support of BUFFER_OVERFLOW when the server answers with a response too big for the pipe read
• fix NTLM with timestamp not specified in the challenge

[codecov]

Codecov Report

Merging #4309 (0fb9108) into master (28c2f78) will decrease coverage by 0.01%.
Report is 3 commits behind head on master.
The diff coverage is 33.33%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4309      +/-   ##
==========================================
- Coverage   82.01%   82.01%   -0.01%     
==========================================
  Files         350      350              
  Lines       82225    82241      +16     
==========================================
+ Hits        67439    67447       +8     
- Misses      14786    14794       +8     

Files	Coverage Δ
scapy/layers/smb2.py	88.48% <ø> (ø)
scapy/layers/ntlm.py	87.14% <0.00%> (+0.17%)	⬆️
scapy/layers/smbclient.py	73.27% <36.36%> (-0.58%)	⬇️

... and 8 files with indirect coverage changes