Summary: CheckZombieLockTest and CheckLockLocationTest should work with different temporary log directories so that they can be run concurrently. This fix changes the name of the log directory used by CheckZombieLockTest.
Reviewed-by: mchung

Summary: In some circumstances j.u.l.FileHandler can leave zombie lock files on the file system. The fix lets FileHandler reuse such zombie lock files when it sees them - as it used to do in version 1.7 of the JDK.
Reviewed-by: alanb