Fix a couple socket tests for short read/write

tests/standalone/io/raw_secure_server_socket_test.dart

Index: tests/standalone/io/raw_secure_server_socket_test.dart
diff --git a/tests/standalone/io/raw_secure_server_socket_test.dart b/tests/standalone/io/raw_secure_server_socket_test.dart
index ba34bedb970581dd53c7f9220cacd58ff47ba823..b9c7e9be42cc07f7b4a8c25a87fc925668497c66 100644
--- a/tests/standalone/io/raw_secure_server_socket_test.dart
+++ b/tests/standalone/io/raw_secure_server_socket_test.dart
@@ -105,7 +105,8 @@ void testSimpleConnectFail(SecurityContext context, bool cancelOnError) {
       Expect.fail("No server connection expected.");
     },
     onError: (error) {
-      Expect.isTrue(error is HandshakeException);
+      Expect.isTrue(error is SocketException ||
+                    error is HandshakeException);
       clientEndFuture.then((_) {
         if (!cancelOnError) server.close();
         asyncEnd();