Boostrap test for NetworkMonitor

This will finally allow to write captive portal detection unit tests.

Bug: 32561414
Bug: 62918393
Test: runtest frameworks-net
Change-Id: I38db1bb79ae80a82b4199dc9cb1b56257e0cf222

services/core/java/com/android/server/connectivity/NetworkAgentInfo.java

@@ -278,6 +278,10 @@ public class NetworkAgentInfo implements Comparable<NetworkAgentInfo> {
         return mHandler;
     }
 
+    public Network network() {
+        return network;
+    }
+
     // Functions for manipulating the requests satisfied by this network.
     //
     // These functions must only called on ConnectivityService's main thread.

tests/net/java/com/android/server/ConnectivityServiceTest.java

@@ -683,7 +683,8 @@ public class ConnectivityServiceTest extends AndroidTestCase {
         public WrappedNetworkMonitor(Context context, Handler handler,
                 NetworkAgentInfo networkAgentInfo, NetworkRequest defaultRequest,
                 IpConnectivityLog log) {
-            super(context, handler, networkAgentInfo, defaultRequest, log);
+            super(context, handler, networkAgentInfo, defaultRequest, log,
+                    NetworkMonitor.NetworkMonitorSettings.DEFAULT);
         }
 
         @Override