Add FreeBSD support

[ptomulik]

This PR provides FreeBSD support. It continues work initiated in PR #32 by @apenney.

It works quite smoothly, with just the following issues:

• requires fpm with workaround for fpm/1107 (it may be available in fpm 1.5.1) or fpm 1.5.0 plus rubygems with rubygems/1608 fixed; there are PRs (fpm/1108, and rubygems/1612) which address these issues, but they're not merged at the moment and not included in publicly available releases (yet), update: fpm 1.6.0 is out and includes necessary fixes, update: rubygems/1612 is merged too,
• I'm not sure how the packer is run in production, I had problems when tried to run it as root directly doing a sequence of sudo packer/script/packager_freebsd.sh + logout/login + sudo package/package.sh /path/to/substrate.zip; for some reason the rvm-installed version of ruby (system-wide) is not used from the root account (it requires rvm use ruby-x.y.z after each and every login),
• depends on puppet-bootstrap/52, which is not merged yet, update: puppet-bootstrap/52 is merged now
• need to provide image_id's in packer/packager.json for FreeBSD (help needed),
• need to provide image_id's in packer/substrate.json for FreeBSD (help needed),

Tested manually on FreeBSD 10.3, x86_64 VM (created with the following Vagrantfile):

Vagrant.configure(2) do |config|
  config.vm.guest = :freebsd
  config.vm.base_mac = "5CA1AB1E0001"
  config.vm.network "private_network", :bridge => 'enp4s0', :mac => "5CA1AB1E0001", :ip => "10.0.1.11"
  config.vm.box = "freebsd/FreeBSD-10.3-RELEASE"
  config.vm.provider :virtualbox do |vb, override|
    vb.customize ["modifyvm", :id, "--memory", "512"]
    vb.customize ["modifyvm", :id, "--cpus", "2"]
    vb.customize ["modifyvm", :id, "--hwvirtex", "on"]
    vb.customize ["modifyvm", :id, "--audio", "none"]
    vb.customize ["modifyvm", :id, "--nictype1", "virtio"]
    vb.customize ["modifyvm", :id, "--nictype2", "virtio"]
  end
 # config.vm.synced_folder "../../", "/vagrant", type: "nfs",  id: "vagrant-root"
 # config.vm.synced_folder "./vagrant-substrate", "/vagrant-substrate", type: "nfs", :nfs_version => 3, :linux__nfs_options => ['async,insecure,no_subtree_check,no_acl,no_root_squash,rw'], id: "vagrant-substrate"
  config.ssh.shell = "/bin/sh"
end

Not tested with packer yet. See also comments in code.

[ptomulik]

Any help with image_id?

[apenney]

2.5 years later @ptomulik and we still can't get a "no" or ack that this PR even exists. Not a fun experience.

[ptomulik]

that makes me sad... looks like @mitchellh became a businessman and abandoned some of his projects...

[ptomulik]

@sethvargo could you help here?

[hashicorp-cla]

All committers have signed the CLA.