Fix breaking issues with OpenBSD

[Jaywalker]

Description

Issue #2990

Fixes the issue of looking up the route table on OpenBSD. The code was largely borrowed from the FreeBSD version, but with minor changes. Also fixes the rc.d daemon which now requires #!/bin/ksh over #!/bin/sh. And lastly fixed the OpenSSL path as it is now part of the base OpenBSD system.

---

PR information

• The title of the PR is clear and informative.
• There are a small number of commits, each of which has an informative message. This means that previously merged commits do not appear in the history of the PR. For information on cleaning up the commits in your pull request, see this page.
• If applicable, the PR references the bug/issue that it fixes in the description.
• New Unit tests were added for the changes made

Quality of Code and Contribution Guidelines

• I have read the contribution guidelines.

[Jaywalker]

@microsoft-github-policy-service agree company="MedSec"

[maddieford]

@Jaywalker Thank you for the contribution! We will review these changes, but we have limited support for OpenBSD so we can't provide a concrete timeline on when we'll complete the review.