Merge into master from pull request #163:

Remove useless extra logging of stack trace and Don't try to clean out old ports in case they're not really in storage (https://github.com/floodlight/floodlight/pull/163)

src/main/java/net/floodlightcontroller/core/internal/Controller.java

@@ -556,7 +556,6 @@ public class Controller implements IFloodlightProviderService,
             } else {
                 log.error("Error while processing message from switch " + sw,
                           e.getCause());
-                log.error(e.getCause().getStackTrace().toString());
                 ctx.getChannel().close();
             }
         }