RFR(M): 8144113: enable jjs testing

[Michael Haupt]

Dear all,

please review this change by Srinivas Dama, which I'm sponsoring.
RFE: https://bugs.openjdk.java.net/browse/JDK-8144113
Webrev: http://cr.openjdk.java.net/~mhaupt/8144113/webrev.00

The change contains some tests for the jjs executable. They are implemented in JavaScript themselves and extensively use the scripting capabilities of Nashorn. 

Thanks,

Michael

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