Local Vagrant environment for portable integration testing

[acornies-tc]

Since this feature doesn't quite fit the issue template, I'll outline it below:

Provide a portable Vagrant environment via Vagrantfile that can:

• Provision entire Hashicorp stack (Docker, Consul, Nomad, Vault) in a standalone VM
• Run OpenFaaS components using Nomad w/ Docker
• Add debugging launch configuration which connects faas gateway to faas-nomad
• Assume Go development is done on host/workstation, the rest is provisioned in the VM
• Facilitate integration testing for all supported features of OpenFaaS

Discussed briefly with @nicholasjackson, but wanted to track it.

[acornies]

This is me ^ forgot to switch accounts when drafting up the issue.

[alexellis]

This would be useful for testing. Do you know if it'd work with KVM on Linux too?

[acornies]

Hi @alexellis, in theory it should be fine with vagrant-libvirt plugin and the libvirt provider (I haven't tried it myself). More info here: https://github.com/vagrant-libvirt/vagrant-libvirt.

I could see adding something like this in the Vagrantfile:

config.vm.provider "libvirt" do |lv|
  lv.cpus = 4
  lv.memory = 1024
  ...
end

then to trigger it would be: vagrant up --provider=libvirt

[nicholasjackson]

Liking this so far, I have left a couple of comments, I think we can probably make things a little more generic.

[nicholasjackson]

Thanks @acornies this is merged in #46