Add netcfg for INT

Use network config subsystem to handle such configs

Change-Id: I8ec14d31c30e3d1d8cd2c703d8db5535bb8b5cd4
(cherry picked from commit 0f1ffd162f0a8fd2a12ac26f12b54519064c4a3b)
diff --git a/core/api/src/test/java/org/onosproject/store/service/TestStorageService.java b/core/api/src/test/java/org/onosproject/store/service/TestStorageService.java
index 48ffeac..df7acf1 100644
--- a/core/api/src/test/java/org/onosproject/store/service/TestStorageService.java
+++ b/core/api/src/test/java/org/onosproject/store/service/TestStorageService.java
@@ -47,7 +47,7 @@
 
     @Override
     public <V> AtomicValueBuilder<V> atomicValueBuilder() {
-        throw new UnsupportedOperationException("atomicValueBuilder");
+        return TestAtomicValue.builder();
     }
 
     @Override