Does not work when provisioners are disabled.

[oxyc]

In the case of Docker containers when provisioners are disabled due to SSH not being available, the Action.update_all never runs.

      action_hook(:hostmanager, :machine_action_up) do |hook|
        hook.after(Vagrant::Action::Builtin::Provision, Action.update_all)
      end

Hostsupdater still adds the hosts because they use:

      action_hook(:hostsupdater, :machine_action_up) do |hook|
        hook.append(Action::UpdateHosts)
      end