RFR 8242859: test/jdk/tools/jlink/JLinkTest.java uses nashorn module

[sundararajan . athijegannathan]

Please review.

Bug: https://bugs.openjdk.java.net/browse/JDK-8242859
Webrev: http://cr.openjdk.java.net/~sundar/8242859/webrev.00/

Relevant JLinkTest.java section deleted as part of nashorn removal is as 
follows:

http://cr.openjdk.java.net/~sundar/8241749/webrev.00/test/jdk/tools/jlink/JLinkTest.java.udiff.html

It was using nashorn module as an example. Using jdk.jshell with the 
current change.

Thanks

-Sundar