move up to Netty 4
diff --git a/src/main/java/net/floodlightcontroller/devicemanager/SwitchPort.java b/src/main/java/net/floodlightcontroller/devicemanager/SwitchPort.java
index 725d699..7426163 100644
--- a/src/main/java/net/floodlightcontroller/devicemanager/SwitchPort.java
+++ b/src/main/java/net/floodlightcontroller/devicemanager/SwitchPort.java
@@ -20,7 +20,7 @@
 import net.floodlightcontroller.core.web.serializers.DPIDSerializer;
 
 import org.codehaus.jackson.map.annotate.JsonSerialize;
-import org.codehaus.jackson.map.ser.std.ToStringSerializer;
+import org.codehaus.jackson.map.ser.ToStringSerializer;
 
 /**
  * A simple switch DPID/port pair