[ONOS-3485] Create arp_op selector and add operation to provifer of
openflow to onos

Change-Id: I4dd0a9d7eb66092d7633e288a1fc94ad66eb4810
diff --git a/core/api/src/main/java/org/onosproject/net/flow/DefaultTrafficSelector.java b/core/api/src/main/java/org/onosproject/net/flow/DefaultTrafficSelector.java
index a842d60..8b2916a 100644
--- a/core/api/src/main/java/org/onosproject/net/flow/DefaultTrafficSelector.java
+++ b/core/api/src/main/java/org/onosproject/net/flow/DefaultTrafficSelector.java
@@ -374,6 +374,11 @@
         }
 
         @Override
+        public Builder matchArpOp(int arpOp) {
+            return add(Criteria.matchArpOp(arpOp));
+        }
+
+        @Override
         public TrafficSelector build() {
             return new DefaultTrafficSelector(ImmutableSet.copyOf(selector.values()));
         }