[ONOS-3405] Change EthType Json encoding to Hex and extend decoding with Hex support alongside int

Change-Id: I629f52016256d6c5cc258ab9e1c5a7b916991d5b
diff --git a/web/api/src/main/resources/definitions/Flows.json b/web/api/src/main/resources/definitions/Flows.json
index ed0767c..7428d73 100644
--- a/web/api/src/main/resources/definitions/Flows.json
+++ b/web/api/src/main/resources/definitions/Flows.json
@@ -168,7 +168,7 @@
               "ethType": {
                 "type": "integer",
                 "format": "int64",
-                "example": -30516
+                "example": "0x88cc"
               }
             }
           }