Register the root resoruce path

The root resource path must be registered before use of ResourceService

Change-Id: I9739522dd28300c27e209f2c88c937537f6a110e
diff --git a/core/store/dist/src/main/java/org/onosproject/store/newresource/impl/ConsistentResourceStore.java b/core/store/dist/src/main/java/org/onosproject/store/newresource/impl/ConsistentResourceStore.java
index 8537cca..82dfe32 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/newresource/impl/ConsistentResourceStore.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/newresource/impl/ConsistentResourceStore.java
@@ -16,6 +16,7 @@
 package org.onosproject.store.newresource.impl;
 
 import com.google.common.annotations.Beta;
+import com.google.common.collect.ImmutableList;
 import org.apache.felix.scr.annotations.Activate;
 import org.apache.felix.scr.annotations.Component;
 import org.apache.felix.scr.annotations.Reference;
@@ -83,6 +84,8 @@
                 .withName(CHILD_MAP)
                 .withSerializer(SERIALIZER)
                 .build();
+
+        childMap.put(ResourcePath.ROOT, ImmutableList.of());
     }
 
     @Override