RFR (S): 8080275: transparently download testng.jar for Nashorn testing

[Michael Haupt]

Dear all,

please review and sponsor this fix:
RFE: https://bugs.openjdk.java.net/browse/JDK-8080275
Webrev: http://cr.openjdk.java.net/~mhaupt/8080275/webrev.00

The Nashorn README file used to contain instructions for how to download and place testng.jar. This is now handled by the "ant externals" command.

Tested by deleting testng.jar and running "ant externals", followed by tests.

Thanks,

Michael

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