Make parse_arp index agnostic

[Slenderman00]

This resolves #2924 by making the parse_arp function index agnostic.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.27%. Comparing base (0f81276) to head (4f4e8df).
Report is 13 commits behind head on 5.10.x.

Additional details and impacted files

@@           Coverage Diff           @@
##           5.10.x    #2925   +/-   ##
=======================================
  Coverage   60.27%   60.27%           
=======================================
  Files         602      602           
  Lines       44098    44099    +1     
=======================================
+ Hits        26579    26580    +1     
  Misses      17519    17519           

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[github-actions]

Test results

     12 files       12 suites   11m 45s ⏱️
3 326 tests 3 326 ✔️ 0 💤 0 ❌
9 453 runs  9 453 ✔️ 0 💤 0 ❌

Results for commit 4f4e8df.

♻️ This comment has been updated with latest results.

[lunkwill42]

Looks good to me. I rebased this on the 5.10.x branch and forced-pushed back to your fork, since this is a bugfix for the 5.10 stable series. Also removed the empty "trigger" commit :)