ONOS-3023 Changing flowTable sets to map so that we can compare
stored vs. new rule when adding and removing

Change-Id: Ibd885023d550af3b2220056fbdf44ad8ec7fefda
diff --git a/core/api/src/main/java/org/onosproject/net/flow/DefaultFlowRule.java b/core/api/src/main/java/org/onosproject/net/flow/DefaultFlowRule.java
index 5492fa9..1164e05 100644
--- a/core/api/src/main/java/org/onosproject/net/flow/DefaultFlowRule.java
+++ b/core/api/src/main/java/org/onosproject/net/flow/DefaultFlowRule.java
@@ -15,6 +15,7 @@
  */
 package org.onosproject.net.flow;
 
+import com.google.common.annotations.Beta;
 import org.onosproject.core.ApplicationId;
 import org.onosproject.core.DefaultGroupId;
 import org.onosproject.core.GroupId;
@@ -284,6 +285,11 @@
         return tableId;
     }
 
+    @Beta
+    public long created() {
+        return created;
+    }
+
     public static Builder builder() {
         return new Builder();
     }