commenting in6_ifaceidtomac function behavior

[MichaelK760]

As said #399 for finish commenting in6_ifaceidtomac in utils6.py

I did my best to explain how the function worked.

[gpotter2]

Nice ! You can remove the #TODO just above now !

[codecov-io]

Codecov Report

Merging #1539 into master will decrease coverage by 0.39%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master    #1539     +/-   ##
=========================================
- Coverage   85.39%   84.99%   -0.4%     
=========================================
  Files         177      176      -1     
  Lines       40895    40088    -807     
=========================================
- Hits        34921    34072    -849     
- Misses       5974     6016     +42

Impacted Files	Coverage Δ
scapy/utils6.py	86.69% <100%> (ø)	⬆️
scapy/consts.py	69.56% <0%> (-21.74%)	⬇️
scapy/arch/pcapdnet.py	42.58% <0%> (-19.77%)	⬇️
scapy/pton_ntop.py	89.04% <0%> (-8.22%)	⬇️
scapy/arch/__init__.py	87.23% <0%> (-6.39%)	⬇️
scapy/automaton.py	76.3% <0%> (-6.07%)	⬇️
scapy/pipetool.py	84.58% <0%> (-5%)	⬇️
scapy/route.py	84.02% <0%> (-4.87%)	⬇️
scapy/__init__.py	83.33% <0%> (-2.39%)	⬇️
scapy/data.py	81.73% <0%> (-2.18%)	⬇️
... and 13 more

[MichaelK760]

All set now!

[gpotter2]

One last thing: we have some automated PEP8 tests.

Your PR fails with

scapy/utils6.py:232:36: E261 at least two spaces before inline comment
scapy/utils6.py:233:20: W291 trailing whitespace
scapy/utils6.py:234:1: W293 blank line contains whitespace
scapy/utils6.py:237:42: W291 trailing whitespace
scapy/utils6.py:238:55: W291 trailing whitespace

[MichaelK760]

Pylint doesn't seem to be giving me any more warnings now