Patch for jigsaw tests to run on all platforms

[Alan Bateman]

Mandy Chung wrote:
>  This patch fixes the jigsaw tests to run on all platforms and also
> replace calls to the java.io.File.renameTo method with
> java.nio.file.Files.move method since on windows File.renameTo
> fails if the target file exists.
>
> Webrev at:
>   http://cr.openjdk.java.net/~mchung/jigsaw/webrevs/jigsaw-tests.00/
I went through the change and looks okay to me.

I'm not sure what to say about test/org/openjdk/jigsaw/hello-native.sh 
as we can't assume a C compiler on the test machine and checking in 
pre-build shared libraries is frowned upon.

I'll leave the JPRT updates to Kelly but I think you should be able to 
run the Jigsaw tests already with -otests '.*jdk_jigsaw.*'

-Alan.