Add acceptance tests for puppet-zuul

Add acceptance tests for puppet-zuul module so that once the module is
applied we check if files were created, packages were installed and
services were started.

Co-Authored-By: Bruno Tavares <btavare@thoughtworks.com>
Co-Authored-By: Danilo Ramalho <dramalho@thoughtworks.com>

Change-Id: I2bd7dbc29c05f9e29127d48a284913bd34fae438

Gemfile

@@ -27,3 +27,9 @@ group :development, :test do
     gem 'puppet', '~> 3.0', :require => false
   end
 end
+
+group :system_tests do
+  gem 'beaker-rspec', :require => false
+end
+
+# vim:ft=ruby