[rewritten] PR #504

[guedou]

This PR adds unit tests to PR#504 and small fixes to dhcp6.py

[codecov-io]

Codecov Report

Merging #576 into master will increase coverage by 1.35%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #576      +/-   ##
==========================================
+ Coverage   74.72%   76.07%   +1.35%     
==========================================
  Files         125      130       +5     
  Lines       30380    31369     +989     
==========================================
+ Hits        22700    23864    +1164     
+ Misses       7680     7505     -175

Impacted Files	Coverage Δ
scapy/layers/dhcp6.py	59.05% <100%> (+0.39%)	⬆️
scapy/layers/inet6.py	77.87% <100%> (+0.23%)	⬆️
scapy/contrib/mpls.py	95% <100%> (+33.88%)	⬆️
scapy/layers/l2.py	81.45% <100%> (+1.25%)	⬆️
bin/UTscapy	100% <0%> (ø)
scapy/tools/__init__.py	100% <0%> (ø)
scapy/arch/winpcapy.py	94.61% <0%> (ø)
scapy/arch/windows/__init__.py	75.6% <0%> (ø)
scapy/arch/windows/compatibility.py	77.04% <0%> (ø)
scapy/layers/inet.py	64.17% <0%> (+0.08%)	⬆️
... and 19 more

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