[ONOS-3391] create arp_spa selector to onos

Change-Id: I2508a3ca7acb95b9792f0b23e085074a5b030a3b
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 65570f8..a842d60 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
@@ -359,6 +359,11 @@
         }
 
         @Override
+        public Builder matchArpSpa(Ip4Address addr) {
+            return add(Criteria.matchArpSpa(addr));
+        }
+
+        @Override
         public Builder matchArpTha(MacAddress addr) {
             return add(Criteria.matchArpTha(addr));
         }