Stop calling ::concat::setup

::concat::setup is a private class deprecated as a public class [1].
This patch makes sure we use concat module the right way and avoid
a warning.

[1] https://github.com/puppetlabs/puppetlabs-concat/blob/master/manifests/setup.pp#L14

Change-Id: Ib7f72f696e8704f3f4d5cff6b06dbcd981d6b395

spec/classes/swift_proxy_swauth_spec.rb

@@ -7,8 +7,7 @@ describe 'swift::proxy::swauth' do
   end
 
   let :pre_condition do
-    'class { "concat::setup": }
-     concat { "/etc/swift/proxy-server.conf": }'
+    'concat { "/etc/swift/proxy-server.conf": }'
   end
 
   let :fragment_file do