Stricter NetworkNotificationManagerTest

This patch changes NetworkNotificationManagerTest to populate extraInfo
of NetworkInfo in order to catch regressions in malformed format Strings
of log statements in NetworkNotificationManager.

Test: verified that the test fails when reintroducing the format String
bug.
Bug: 33737715

(cherry picked from commit 3cb1d2b45d)

Change-Id: Ic2f23e860a17cb83b90edcfd2ba365134cacfe36

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

@@ -182,7 +182,7 @@ public class NetworkNotificationManager {
             details = r.getString(R.string.network_switch_metered_detail, toTransport,
                     fromTransport);
         } else {
-            Slog.wtf(TAG, "Unknown notification type " + notifyType + "on network transport "
+            Slog.wtf(TAG, "Unknown notification type " + notifyType + " on network transport "
                     + getTransportName(transportType));
             return;
         }