acceptance/rabbitmq: include apt in scope

We neew now to include ::apt in the scope otherwise the catalog will
have warnings when running puppetlabs-rabbitmq module.

Change-Id: I0ed73073b65e782787918ba04bfcc3dafbc1b0f0

spec/acceptance/rabbitmq_spec.rb

@@ -24,6 +24,7 @@ describe 'openstacklib class' do
         }
         $package_provider = 'yum'
       } else {
+        include ::apt
         $package_provider = 'apt'
       }