test.py: Print command line when starting http servers in case of '--verbose'

tools/test.dart

Index: tools/test.dart
diff --git a/tools/test.dart b/tools/test.dart
index 192800eb6b654f06e2486f29e86bcdc0b0446bb6..3147a3698d4046fc1a27d63ed346bf7a2f547fff 100755
--- a/tools/test.dart
+++ b/tools/test.dart
@@ -147,6 +147,12 @@ void testConfigurations(List<Map> configurations) {
                                        conf['runtime']);
       serverFutures.add(servers.startServers(conf['local_ip']));
       conf['_servers_'] = servers;
+      if (verbose) {
+        serverFutures.last.then((_) {
+          var commandline = servers.httpServerCommandline();
+          print('Started HttpServers: $commandline');
+        });
+      }
     }
 
     // There should not be more than one InternetExplorerDriver instance