RFR 9: 8081565 : javac lint warnings in jdk testlibrary

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