Add resource API to query registered resource

Change-Id: Ibf53a0fa383043d17e78578093eb3055631796d0
diff --git a/core/net/src/main/java/org/onosproject/net/newresource/impl/ResourceManager.java b/core/net/src/main/java/org/onosproject/net/newresource/impl/ResourceManager.java
index 83ae6e0..ae7c7f4 100644
--- a/core/net/src/main/java/org/onosproject/net/newresource/impl/ResourceManager.java
+++ b/core/net/src/main/java/org/onosproject/net/newresource/impl/ResourceManager.java
@@ -158,6 +158,13 @@
     }
 
     @Override
+    public Collection<Resource> getRegisteredResources(Resource parent) {
+        checkNotNull(parent);
+
+        return store.getChildResources(parent);
+    }
+
+    @Override
     public boolean isAvailable(Resource resource) {
         checkNotNull(resource);