Fix warnings in storage/server.pp.

Updates the swift storage/server class so that we quote $pipeline
before doing a comparison check for the server type. This fixes
an issue where warnings would always get printed when using the
default $pipeline variable.

Fixes LP Bug #1171052.

Change-Id: I3076b6110f1a42c0e6c179d18952b0b013908f01

manifests/storage/server.pp

@@ -25,7 +25,7 @@ define swift::storage::server(
   # TODO if array does not include type-server, warn
   if(
     (is_array($pipeline) and ! member($pipeline, "${type}-server")) or
-    $pipeline != "${type}-server"
+    "$pipeline" != "${type}-server"
   ) {
       warning("swift storage server ${type} must specify ${type}-server")
   }