Better error logging in DistributedDynamicConfigStore

- constant for built-in resourceId

Change-Id: If36e2e3023b0bd3068ecc75d54d263be0b2410b6
diff --git a/apps/config/src/main/java/org/onosproject/d/config/DeviceResourceIds.java b/apps/config/src/main/java/org/onosproject/d/config/DeviceResourceIds.java
index a49c6fc..605ae63 100644
--- a/apps/config/src/main/java/org/onosproject/d/config/DeviceResourceIds.java
+++ b/apps/config/src/main/java/org/onosproject/d/config/DeviceResourceIds.java
@@ -68,6 +68,12 @@
             .addBranchPointSchema(ROOT_NAME, DCS_NAMESPACE)
             .build();
 
+    public static final ResourceId DEVICES_ID = ResourceId.builder()
+            .addBranchPointSchema(ROOT_NAME, DCS_NAMESPACE)
+            .addBranchPointSchema(DEVICES_NAME, DCS_NAMESPACE)
+            .build();
+
+
     static final NodeKey<?> ROOT_NODE =
             NodeKey.builder().schemaId(ROOT_NAME, DCS_NAMESPACE).build();