RFR 9: 8081565 : javac lint warnings in jdk testlibrary

[Roger Riggs]

Please review test library changes to remove javac lint warnings.
And 1 test that incorrectly used try-with-resources.

Webrev:
    http://cr.openjdk.java.net/~rriggs/webrev-testlint-8081565/

Issue:
      https://bugs.openjdk.java.net/browse/JDK-8081565

Thanks, Roger