Keys based on longs should display in hexadecimal

Change-Id: I45d826a4e8c24271d6689f9438d5eca78f557241
diff --git a/core/api/src/main/java/org/onosproject/net/intent/Key.java b/core/api/src/main/java/org/onosproject/net/intent/Key.java
index 7007f75..a60b703 100644
--- a/core/api/src/main/java/org/onosproject/net/intent/Key.java
+++ b/core/api/src/main/java/org/onosproject/net/intent/Key.java
@@ -103,7 +103,7 @@
 
         @Override
         public String toString() {
-            return Long.toString(key);
+            return "0x" + Long.toHexString(key);
         }
 
         @Override
diff --git a/core/net/src/test/java/org/onosproject/net/intent/impl/ObjectiveTrackerTest.java b/core/net/src/test/java/org/onosproject/net/intent/impl/ObjectiveTrackerTest.java
index da7bb4b..6352bff 100644
--- a/core/net/src/test/java/org/onosproject/net/intent/impl/ObjectiveTrackerTest.java
+++ b/core/net/src/test/java/org/onosproject/net/intent/impl/ObjectiveTrackerTest.java
@@ -56,7 +56,6 @@
 /**
  * Tests for the objective tracker.
  */
-@Ignore
 public class ObjectiveTrackerTest {
     private static final int WAIT_TIMEOUT_SECONDS = 2;
     private Topology topology;