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/TestAtomicValue.java b/core/api/src/test/java/org/onosproject/store/service/TestAtomicValue.java
new file mode 100644
index 0000000..2ab645e
--- /dev/null
+++ b/core/api/src/test/java/org/onosproject/store/service/TestAtomicValue.java
@@ -0,0 +1,80 @@
+/*
+ * Copyright 2020-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.store.service;
+
+import java.util.concurrent.CompletableFuture;
+import java.util.concurrent.atomic.AtomicReference;
+
+public class TestAtomicValue<V> implements AsyncAtomicValue<V> {
+
+    private AtomicReference<V> ref;
+    private String name;
+
+    TestAtomicValue(String name) {
+        ref = new AtomicReference<>();
+        this.name = name;
+    }
+
+    @Override
+    public CompletableFuture<Boolean> compareAndSet(V expect, V update) {
+        return CompletableFuture.completedFuture(ref.compareAndSet(expect, update));
+    }
+
+    @Override
+    public CompletableFuture<V> get() {
+        return CompletableFuture.completedFuture(ref.get());
+    }
+
+    @Override
+    public CompletableFuture<V> getAndSet(V value) {
+        return CompletableFuture.completedFuture(ref.getAndSet(value));
+    }
+
+    @Override
+    public CompletableFuture<Void> set(V value) {
+        ref.set(value);
+        return CompletableFuture.completedFuture(null);
+    }
+
+    @Override
+    public CompletableFuture<Void> addListener(AtomicValueEventListener<V> listener) {
+        // Unimplemented
+        return CompletableFuture.completedFuture(null);
+    }
+
+    @Override
+    public CompletableFuture<Void> removeListener(AtomicValueEventListener<V> listener) {
+        // Unimplemented
+        return CompletableFuture.completedFuture(null);
+    }
+
+    @Override
+    public String name() {
+        return name;
+    }
+
+    public static Builder builder() {
+        return new Builder();
+    }
+
+    public static class Builder extends AtomicValueBuilder {
+
+        @Override
+        public AsyncAtomicValue build() {
+            return new TestAtomicValue<>("");
+        }
+    }
+}