Openbsd support

[avis]

@ValarDragon

• Linked to github-issue with discussion and accepted design OR link to spec that describes this work.
• Updated all relevant documentation (docs/)
• Updated all relevant code comments
• Wrote tests
• Added entries in PENDING.md that include links to the relevant issue or PR that most accurately describes the change.
• Updated cmd/gaia and examples/

---

For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge pull request #XYZ: [title]" (coding standards)

[codecov]

Codecov Report

Merging #1989 into develop will increase coverage by <.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #1989      +/-   ##
===========================================
+ Coverage    64.86%   64.86%   +<.01%     
===========================================
  Files          115      114       -1     
  Lines         6862     6837      -25     
===========================================
- Hits          4451     4435      -16     
+ Misses        2127     2120       -7     
+ Partials       284      282       -2

[ValarDragon]

utACK, Thanks for fixing this, much appreciated :)

[melekes]

utACK

[cwgoes]

utACK, thanks