RFR: JDK-8071464: Clear up SVC jdk/test/* JRE layout dependencies other than those on tools.jar

[Alexander Kulyakhtin]

Hi,

Could you, please, review the fix below.

bug: https://bugs.openjdk.java.net/browse/JDK-8071464
webrev: http://cr.openjdk.java.net/~eistepan/~akulyakhtin/8071464/webrev.01/

References to the jre layout are removed from ShellScaffold.sh and 
DemoRun.java. 
Other files mentioned in the CR have not been changed as they don't contain any 
JRE-related artifacts anymore.

Thanks,
Alex