RRF: JDK-8232280: close() is not called on return value of Files.walk()

[Andy Herrick]

fixing subject line ...

On 10/16/2019 4:03 PM, Andy Herrick wrote:
> Please review the jpackage fix for bug [1] at [2].
>
> This is a fix for the JDK-8200758-branch branch of the open sandbox 
> repository (jpackage).
>
> Fix is to wrap all Files.walk() calls in try-with-resource blocks.
>
> [1] https://bugs.openjdk.java.net/browse/JDK-8232280
>
> [2] http://cr.openjdk.java.net/~herrick/8232280/webrev.01/
>
> /Andy
>