JDK 9 RFR of 8175042: Add success message to java/io/FileInputStream/LargeFileAvailable.java

[Brian Burkhalter]

Please review this trivial fix [1] for [2]. The intent is to add to the test 
log evidence that the test in fact completed. Also cf. [3].

Thanks,

Brian

[1] diff

--- a/test/java/io/FileInputStream/LargeFileAvailable.java
+++ b/test/java/io/FileInputStream/LargeFileAvailable.java
@@ -71,6 +71,9 @@
         } finally {
             file.delete();
         }
+
+        System.out.println("Test succeeded.");
+        System.out.flush();
     }

[2] https://bugs.openjdk.java.net/browse/JDK-8175042
[3] http://mail.openjdk.java.net/pipermail/nio-dev/2017-February/004130.html