ONOS- 2946 Adding ability to view existing packet intercept requests and packet processors.

Change-Id: Id0d82fb4a19506ec607a71856dbf0c33c8e51baf
diff --git a/core/api/src/main/java/org/onosproject/net/packet/PacketStore.java b/core/api/src/main/java/org/onosproject/net/packet/PacketStore.java
index ff45cc0..97f7cb5 100644
--- a/core/api/src/main/java/org/onosproject/net/packet/PacketStore.java
+++ b/core/api/src/main/java/org/onosproject/net/packet/PacketStore.java
@@ -17,7 +17,7 @@
 
 import org.onosproject.store.Store;
 
-import java.util.Set;
+import java.util.List;
 
 /**
  * Manages routing of outbound packets.
@@ -52,8 +52,8 @@
     /**
      * Obtains all existing requests in the system.
      *
-     * @return a set of packet requests
+     * @return list of packet requests in order of priority
      */
-    Set<PacketRequest> existingRequests();
+    List<PacketRequest> existingRequests();
 
 }