Fix https_bad_certificate_test: allow for session cache to be hit in all getUrl calls

tests/standalone/io/https_bad_certificate_client.dart

Index: tests/standalone/io/https_bad_certificate_client.dart
diff --git a/tests/standalone/io/https_bad_certificate_client.dart b/tests/standalone/io/https_bad_certificate_client.dart
index 90db4694a891f570fa916faf0520882eb382811c..9a26ab62612e04b5f1361a0e18dfa1a9bf4775e6 100644
--- a/tests/standalone/io/https_bad_certificate_client.dart
+++ b/tests/standalone/io/https_bad_certificate_client.dart
@@ -38,10 +38,10 @@ Future runHttpClient(int port, result) {
 
   HttpClient client = new HttpClient();
 
-  var testFutures = [];
+  var testFutures = [];  // The three async getUrl calls run simultaneously.
   testFutures.add(client.getUrl(Uri.parse('https://$HOST_NAME:$port/$result'))
     .then((HttpClientRequest request) {
-      expect(false);
+      expect(result == 'true');  // The session cache may keep the session.
     }, onError: (e) {
       expect(e is HandshakeException || e is SocketException);
     }));