Adding NetworkConfigRegistryAdapter for writing Unit Tests for DHCP

Change-Id: I8047dc6e7dda9aef5b5eed53b74cc94469480747

+/*
+ * Copyright 2014-2015 Open Networking Laboratory
+ *
+ * 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.incubator.net.config;
+
+import java.util.Set;
+
+/**
+ * Test adapter for network configuration service registry.
+ */
+public class NetworkConfigRegistryAdapter extends NetworkConfigServiceAdapter implements NetworkConfigRegistry {
+
+    public void registerConfigFactory(ConfigFactory configFactory) {
+    }
+
+    public void unregisterConfigFactory(ConfigFactory configFactory) {
+    }
+
+    public Set<ConfigFactory> getConfigFactories() {
+        return null;
+    }
+
+    public <S, C extends Config<S>> Set<ConfigFactory<S, C>> getConfigFactories(Class<S> subjectClass) {
+        return null;
+    }
+
+    public <S, C extends Config<S>> ConfigFactory<S, C> getConfigFactory(Class<C> configClass) {
+        return null;
+    }
+}