fix rspec-puppet version < 1

rspec-puppet > 1 removed access to the catalog object causing many tests
to fail. Eg.:

  1) jboss Test installation via netinstall should install version 6 via
netinstall
     Failure/Error: content = catalogue.resource('puppi::netinstall',
'netinstall_jboss').send(:parameters)[:url]
     ArgumentError:
       wrong number of arguments (0 for 1)
     # ./spec/classes/jboss_spec.rb:18:in `block (3 levels) in <top
     # (required)>'