Implement packet seriailizer and deserializer for LACP

Change-Id: Idbbd87a3ddeb477cac49a65e6a5c768761019e11
diff --git a/utils/misc/src/main/java/org/onlab/packet/EthType.java b/utils/misc/src/main/java/org/onlab/packet/EthType.java
index 6976a15..c69ed145e 100644
--- a/utils/misc/src/main/java/org/onlab/packet/EthType.java
+++ b/utils/misc/src/main/java/org/onlab/packet/EthType.java
@@ -38,6 +38,7 @@
         MPLS_UNICAST(0x8847, "mpls_unicast", org.onlab.packet.MPLS.deserializer()),
         MPLS_MULTICAST(0x8848, "mpls_multicast", org.onlab.packet.MPLS.deserializer()),
         EAPOL(0x888e, "eapol", org.onlab.packet.EAPOL.deserializer()),
+        SLOW(0x8809, "slow", org.onlab.packet.Slow.deserializer()),
         UNKNOWN(0, "unknown", null);