[8u60] Please approve 8076646: nashorn tests should avoid using package names used by nashorn sources

[A. Sundararajan]

Please approve.

Bug: https://bugs.openjdk.java.net/browse/JDK-8076646
jdk9 review thread: 
http://mail.openjdk.java.net/pipermail/nashorn-dev/2015-April/004422.html
jdk8u-dev webrev: http://cr.openjdk.java.net/~sundar/8076646/8u60/webrev.00/
ParserAPITest.java does not exist in jdk8 (that is jdk9 specific API 
test). Other than diff on that file, everything else is backported 'as is'.

-Sundar