Fix compatibility with latest puppetlabs-concat

concat::setup has been made a private class and can no longer be
included from modules outside concat itself.

concat::setup is already included by the concat define. Removing
its inclusion from puppet-swift classes shouldn't result in breakage
or loss of functionality.

Change-Id: I7566e09bd4e93aec719a495279cf92d8a898057e
Closes-bug: #1245936
(cherry picked from commit 23cc3616cea78b8431181af748a1827add18974f)