Add default spec acceptance helper
user
```ruby
require 'beaker-rspec'

hosts.each do |host|
  # Install Puppet
  on host, install_puppet
end

RSpec.configure do |c|
  module_root = File.expand_path(File.join(File.dirname(__FILE__), '..'))

  c.formatter = :documentation

  # Configure all nodes in nodeset
  c.before :suite do
    # Install module
    puppet_module_install(:source => module_root, :module_name => 'nsd')
    hosts.each do |host|
      on host, puppet('module', 'install', 'puppetlabs-stdlib'), {:acceptable_exit_codes => [0, 1]}
      on host, puppet('module', 'install', 'puppetlabs-concat'), {:acceptable_exit_codes => [0, 1]}
    end
  end
end
```
assistant