RFR 8242860: test/jdk/tools/jlink/ModuleNamesOrderTest.java uses nashorn module

[sundararajan.athijegannathan at oracle.com]

Hi,

nashorn modules were used only as an example in this test. Using 
jdk.jshell module instead to test
known module dependencies in jlink produced images.

Please review.

Bug: https://bugs.openjdk.java.net/browse/JDK-8242860
Webrev: http://cr.openjdk.java.net/~sundar/8242860/webrev.00/

Thanks,

-Sundar