Adding JSON output for intent list command.
diff --git a/core/net/src/main/java/org/onlab/onos/net/intent/impl/IntentManager.java b/core/net/src/main/java/org/onlab/onos/net/intent/impl/IntentManager.java
index 03d5ce8..bfdc57e 100644
--- a/core/net/src/main/java/org/onlab/onos/net/intent/impl/IntentManager.java
+++ b/core/net/src/main/java/org/onlab/onos/net/intent/impl/IntentManager.java
@@ -153,6 +153,12 @@
     }
 
     @Override
+    public List<Intent> getInstallableIntents(IntentId intentId) {
+        checkNotNull(intentId, INTENT_ID_NULL);
+        return store.getInstallableIntents(intentId);
+    }
+
+    @Override
     public void addListener(IntentListener listener) {
         listenerRegistry.addListener(listener);
     }