RFR 8202292 : test/jdk/java/io/FileOutputStream/UnreferencedFOSClosesFd.java fails with "raw fd count wrong"

[Roger Riggs]

Please review a test improvement to avoid spurious errors caused by 
concurrent changes in open files during the test.
The other existing conditions in the test are sufficient to verify the 
correct finalize behavior.
Some additional diagnostics are added and the tests removed from the 
problem list.

Webrev:
http://cr.openjdk.java.net/~rriggs/webrev-count-wrong-8202292/index.html
Issue:
  https://bugs.openjdk.java.net/browse/JDK-8202292

Thanks, Roger