Fix Swift called with bad argument.

The value of `${auth_url}` is interpolated into the onlyif/unless
of exec swift-dispersion-populate.

This is a quick & dirty fix that let us use a non-interpolated variable.

The proper way would be to add `endpoint_type` as a parameter to the
dispersion.pp file in the puppet-swift module.

close #58

manifests/object/controller.pp

@@ -87,8 +87,9 @@ cache = swift.cache')
   }
 
   class { 'swift::dispersion':
-    auth_url  => "http://${ks_keystone_internal_host}:${ks_keystone_internal_port}/v2.0
-endpoint_type=internalURL",
+    auth_url  => "http://${ks_keystone_internal_host}:${ks_keystone_internal_port}/v2.0",
+    swift_dir => '/etc/swift
+endpoint_type=internalURL',
     auth_pass => $ks_swift_dispersion_password
   }