Added a new test applications to monitor network configuration change events and log them.

Change-Id: I882fc1b18cedc67fc83c405c2f8d06078fa15c23
diff --git a/apps/test/netcfg-monitor/src/main/java/org/onosproject/netcfgmonitor/NetCfgEventMonitor.java b/apps/test/netcfg-monitor/src/main/java/org/onosproject/netcfgmonitor/NetCfgEventMonitor.java
new file mode 100644
index 0000000..eb96857
--- /dev/null
+++ b/apps/test/netcfg-monitor/src/main/java/org/onosproject/netcfgmonitor/NetCfgEventMonitor.java
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2016-present 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.netcfgmonitor;
+
+import org.apache.felix.scr.annotations.Activate;
+import org.apache.felix.scr.annotations.Component;
+import org.apache.felix.scr.annotations.Deactivate;
+import org.apache.felix.scr.annotations.Reference;
+import org.onosproject.net.config.NetworkConfigEvent;
+import org.onosproject.net.config.NetworkConfigListener;
+import org.onosproject.net.config.NetworkConfigService;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Network configuration monitor.
+ */
+@Component(immediate = true)
+public class NetCfgEventMonitor {
+
+    private Logger log = LoggerFactory.getLogger(getClass());
+
+    @Reference
+    protected NetworkConfigService networkConfigService;
+
+    private final NetworkConfigListener listener = new InternalListener();
+
+    @Activate
+    protected void activate() {
+        networkConfigService.addListener(listener);
+    }
+
+    @Deactivate
+    protected void deactivate() {
+        networkConfigService.removeListener(listener);
+    }
+
+    private class InternalListener implements NetworkConfigListener {
+        @Override
+        public void event(NetworkConfigEvent event) {
+            log.info("Received event {}", event);
+        }
+    }
+}
diff --git a/apps/test/netcfg-monitor/src/main/java/org/onosproject/netcfgmonitor/package-info.java b/apps/test/netcfg-monitor/src/main/java/org/onosproject/netcfgmonitor/package-info.java
new file mode 100644
index 0000000..a41e935
--- /dev/null
+++ b/apps/test/netcfg-monitor/src/main/java/org/onosproject/netcfgmonitor/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2016-present 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.
+ */
+
+/**
+ * Network configuration event monitor app.
+ */
+package org.onosproject.netcfgmonitor;
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