add SmartOS support

[aqw]

In addition to a new SmartOS.yml var file, this PR makes configurable the location of sshd (sshd_path) and ssh host keys (ssh_host_keys_dir).

The introduction of ssh_host_keys_dir is not strictly necessary, as the user can specify ssh_host_key_files. For that reason, I split it into its own commit, so you can cherry-pick around it if you so choose. However, I felt adding it was preferable, as it will work out-of-the-box, and doesn't require the user to keep ssh_host_key_files and ssh_host_key_algorithms in sync.

Neither of these were added to the README, as it seems to focus on user-visible variables, which neither of these are.

[aqw]

Pushed fix for linting and removal of trailing /.

The Fedora failure is unclear to me. Perhaps spurious?

[aqw]

I did a force push (no changes) to kick off CI again. Indeed, the Fedora failure was spurious. All tests pass.

[rndmh3ro]

Hey @aqw the Fedora tests are unrelated, you can ignore them.

I'll check out your PR!

[aqw]

Pushed to add SmartOS to meta/main.yml and not remove --- heading from var files.

[aqw]

A friendly ping. Just let me know if anything needs to be reworked. :-)

[rndmh3ro]

Sorry, I haven't had a chance to look at this yet.
I will probably not merge the location variables, however adding smartos support sounds good. Do you have a way to do automatic tests for this OS?

[aqw]

No worries. :-)

Re tests: It looks like you're using Travis to spin up Docker instances. SmartOS descends from Solaris, and Travis itself has no direct support for it. I think this will have to be like the *BSD platforms and remain untested. :-/

[rndmh3ro]

On further consideration I'll merge the whole PR if you can fix the conflicts. :)

[aqw]

I'll take a look at this today.

[aqw]

The patches have been refreshed.

[rndmh3ro]

Thank you!