Create ring builders under swift user

Since we're running ring rebalance unser 'swift' user, we also
need to create ring builders under the same user.

Change-Id: I19a90cf0eea8718213fa7438618dc479a7b0ac3d
Closes-bug: #1405755

deployment/puppet/swift/manifests/ringbuilder/create.pp

@@ -39,6 +39,7 @@ define swift::ringbuilder::create(
   exec { "create_${name}":
     command     => "swift-ring-builder /etc/swift/${name}.builder create ${part_power} ${replicas} ${min_part_hours}",
     path        => ['/usr/bin'],
+    user        => 'swift',
     creates     => "/etc/swift/${name}.builder",
   }