Following the license change, modify the boilerplates in test/

Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/7767)

test/exdatatest.c

diff --git a/test/exdatatest.c b/test/exdatatest.c
index bc39a14..db4e0ff 100644
--- a/test/exdatatest.c
+++ b/test/exdatatest.c
@@ -1,7 +1,7 @@
 /*
  * Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved.
  *
- * Licensed under the OpenSSL license (the "License").  You may not use
+ * Licensed under the Apache License 2.0 (the "License").  You may not use
  * this file except in compliance with the License.  You can obtain a copy
  * in the file LICENSE in the source distribution or at
  * https://www.openssl.org/source/license.html