Add Vagrant based smoke tests (#1067)

* WIP smoke test freebsd

* fix bitrot

We now test that the firewall blocks inbound on host3 from host2

* WIP ipv6 test

* cleanup

* rename to make clear

* fix filename

* restore

* no sudo docker

* WIP

* WIP

* WIP

* WIP

* extra smoke tests

* WIP

* WIP

* add over improvements made in smoke.sh

* more tests

* use generic/freebsd14

* cleanup from test

* smoke test openbsd-amd64

* add netbsd-amd64

* try to fix vagrant

.github/workflows/smoke/vagrant-linux-386/Vagrantfile

@@ -0,0 +1,7 @@
+# -*- mode: ruby -*-
+# vi: set ft=ruby :
+Vagrant.configure("2") do |config|
+  config.vm.box = "ubuntu/xenial32"
+
+  config.vm.synced_folder "../build", "/nebula"
+end