Change the way to load the Redis config to allow clusters

lib/remote_storage/swift.rb

@@ -346,7 +346,7 @@ module RemoteStorage
     end
 
     def redis
-      @redis ||= Redis.new(host: settings.redis["host"], port: settings.redis["port"])
+      @redis ||= Redis.new(settings.redis)
     end
 
     def etag_for(body)