very basic broken reactive forwarding; nit yet using treatments, but rather defaulting to flood for everything

generates a ton of duplicates for now
diff --git a/core/api/src/main/java/org/onlab/onos/net/packet/DefaultPacketContext.java b/core/api/src/main/java/org/onlab/onos/net/packet/DefaultPacketContext.java
index 6b77225..923f168 100644
--- a/core/api/src/main/java/org/onlab/onos/net/packet/DefaultPacketContext.java
+++ b/core/api/src/main/java/org/onlab/onos/net/packet/DefaultPacketContext.java
@@ -1,13 +1,20 @@
 package org.onlab.onos.net.packet;
 
+import org.onlab.onos.net.flow.DefaultTrafficTreatment;
+import org.onlab.onos.net.flow.TrafficTreatment;
+import org.onlab.onos.net.flow.TrafficTreatment.Builder;
+
 
 public abstract class DefaultPacketContext implements PacketContext {
 
     private final long time;
     private final InboundPacket inPkt;
     private final OutboundPacket outPkt;
+    private final TrafficTreatment.Builder builder;
+
     private boolean block = false;
 
+
     protected DefaultPacketContext(long time, InboundPacket inPkt,
             OutboundPacket outPkt, boolean block) {
         super();
@@ -15,6 +22,7 @@
         this.inPkt = inPkt;
         this.outPkt = outPkt;
         this.block = block;
+        this.builder = new DefaultTrafficTreatment.Builder();
     }
 
     @Override
@@ -33,6 +41,11 @@
     }
 
     @Override
+    public Builder treatmentBuilder() {
+        return builder;
+    }
+
+    @Override
     public abstract void send();
 
     @Override