RFR: 8283719: java/util/logging/CheckZombieLockTest.java failing intermittently

[Daniel Fuchs]

Please find enclosed a patch for 
`8283719: java/util/logging/CheckZombieLockTest.java failing intermittently`

My analysis is that the test fails intermittently because the `FileChannel` created by the test is garbage collected too early, which releases the associated lock before the `FileHandler` is created.
I have replaced the `try { } finally { }` with a `try-with-resource( ) { } finally { }` which will prevent the `FileChannel` from being released before the end of the block. Additional bonus: this should also help with the code that tries to cleanup the files at the end.

Though I haven't been able to reproduce the exact failure yet, I haven't observed the new version of the test failing either.

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Commit messages:
 - 8283719: java/util/logging/CheckZombieLockTest.java failing intermittently

Changes: https://git.openjdk.java.net/jdk/pull/8168/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=8168&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8283719
  Stats: 6 lines in 1 file changed: 2 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8168.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8168/head:pull/8168

PR: https://git.openjdk.java.net/jdk/pull/8168