Getting router interface config into the corsa dataplane pipeline

Change-Id: I67d5bf7a20190b07a7bf55c7b60f771877ca8dbb
diff --git a/core/api/src/main/java/org/onosproject/net/flow/DefaultTrafficTreatment.java b/core/api/src/main/java/org/onosproject/net/flow/DefaultTrafficTreatment.java
index a8880b0..f20d6cc 100644
--- a/core/api/src/main/java/org/onosproject/net/flow/DefaultTrafficTreatment.java
+++ b/core/api/src/main/java/org/onosproject/net/flow/DefaultTrafficTreatment.java
@@ -255,6 +255,11 @@
         }
 
         @Override
+        public Builder popVlan() {
+            return add(Instructions.popVlan());
+        }
+
+        @Override
         public TrafficTreatment build() {
 
             //If we are dropping should we just return an empty list?