Adding JSON output for intent list command.
diff --git a/core/api/src/test/java/org/onlab/onos/net/intent/FakeIntentManager.java b/core/api/src/test/java/org/onlab/onos/net/intent/FakeIntentManager.java
index 4b3fd37..5020459 100644
--- a/core/api/src/test/java/org/onlab/onos/net/intent/FakeIntentManager.java
+++ b/core/api/src/test/java/org/onlab/onos/net/intent/FakeIntentManager.java
@@ -196,6 +196,11 @@
     }
 
     @Override
+    public List<Intent> getInstallableIntents(IntentId intentId) {
+        return installables.get(intentId);
+    }
+
+    @Override
     public void addListener(IntentListener listener) {
         listeners.add(listener);
     }