RFR: JDK-8075725: Remove /jre subdir in hotspot dist dir

[Tim Bell]

Erik:

> In JDK 9, the /jre sub directory in the jdk image has been removed. We 
> should also remove this in the hotspot dist output directory and the 
> corresponding import logic in the jdk build.
>
> There are still references to /jre in hotspot.script and build.sh, but 
> since I don't know how or if these files are used, I don't dare 
> changing them.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8075725
> Webrev: http://cr.openjdk.java.net/~erikj/8075725/webrev.01/

Looks good to me, although I am not a 'R'eviewer in hotspot territory...

Tim