hosts setup

  hostname, *aliases = wordpress_sites.flat_map { |(_name, site)| site['site_hosts'] }
  config.vm.hostname = hostname
  www_aliases = ["www.#{hostname}"] + aliases.map { |host| "www.#{host}" }

  if Vagrant.has_plugin? 'vagrant-hostsupdater'
    config.hostsupdater.aliases = aliases + www_aliases
  else
    fail_with_message "vagrant-hostsupdater missing, please install the plugin with this command:\nvagrant plugin install vagrant-hostsupdater"
  end