Match Netbios responses for hostnames over length 15

[lawndoc]

Scapy handles long netbios hostname queries by trimming the hostname to the maximum of 15 characters before sending the request. When a response is sent back, Scapy fails to match the response to the request because it matches the trimmed hostname against the full-length one originally requested.

This PR will trim the original hostname being queried when matching requests in answers.

This is referenced in issue #4443

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 81.46%. Comparing base (a1afb9a) to head (59577a6). Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4446      +/-   ##
==========================================
- Coverage   81.46%   81.46%   -0.01%     
==========================================
  Files         353      353              
  Lines       84477    84481       +4     
==========================================
- Hits        68822    68820       -2     
- Misses      15655    15661       +6     

Files	Coverage Δ
scapy/fields.py	92.63% <100.00%> (+0.01%)	:arrow_up:

... and 7 files with indirect coverage changes

[lawndoc]

Hi, just wanted to check in and see if there's anything else needed on my end for this PR?