DNS over TCP: support dns_resolve

[gpotter2]

• fix DNS over TCP not working properly

[codecov]

Codecov Report

❌ Patch coverage is 88.88889% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 80.88%. Comparing base (c7aa3e9) to head (4716eee).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
scapy/layers/dns.py	88.88%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4835   +/-   ##
=======================================
  Coverage   80.88%   80.88%           
=======================================
  Files         368      368           
  Lines       90231    90237    +6     
=======================================
+ Hits        72980    72986    +6     
  Misses      17251    17251           

Files with missing lines	Coverage Δ
scapy/layers/dns.py	83.61% <88.88%> (-0.01%)	⬇️

... and 4 files with indirect coverage changes

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