Packet throttle support

Change-Id: I6f2da5ed25f794561349013bfcbf9afa85d5e190
diff --git a/core/api/src/test/java/org/onosproject/net/packet/PacketServiceAdapter.java b/core/api/src/test/java/org/onosproject/net/packet/PacketServiceAdapter.java
index 5a1dfd5..10fa7e2 100644
--- a/core/api/src/test/java/org/onosproject/net/packet/PacketServiceAdapter.java
+++ b/core/api/src/test/java/org/onosproject/net/packet/PacketServiceAdapter.java
@@ -69,4 +69,9 @@
     @Override
     public void emit(OutboundPacket packet) {
     }
+
+    @Override
+    public List<PacketInFilter> getFilters() {
+        return null;
+    }
 }