<Swing Dev> RFR: 8171363: [PIT] Four Windows-specific tests fail with InaccessibleObjectException when calling Field.setAccessible()

[Phil Race]

Bug: https://bugs.openjdk.java.net/browse/JDK-8171363
Webrev: http://cr.openjdk.java.net/~prr/8171363/

this is mostly about jtreg syntax.

A few tests fail due to the updated module system spec.
jtreg needs to allow them to access package private fields.
":open" is added on the tests that do this and need runtime access to 
the non-exported package
":+open" is added on the tests also need compile-time access.

-phil.