[11u] 8262465: DirectIOTest fails on a system with large block size

[Sergey Nazarkin]

Hi!

I’d like to back port this fix for DirectIOTest. The test is failed on FS with r/w blocks larger than 4k. 

The fix doesn’t apply cleanly due to missed "8244224: Implementation of JEP 381: Remove the Solaris and SPARC Ports”. Manual modification is required for
- copyright year
-  isDirectIOSupportedByFS remains in the code

Related backport of JDK-8265231is not required since no public functions are affected. 

Bug: https://bugs.openjdk.java.net/browse/JDK-8264821
Original fix: https://git.openjdk.java.net/jdk/commit/7e4cd480
Webrev: http://cr.openjdk.java.net/~snazarki/jdk11u/8264821/