8170936: Logging: LogFileOutput.invalid_file_test crashes when executed twice.
Reviewed-by: iignatyev, stuefe

8165687: Fix license and copyright headers in jd9 under hotspot/test
Summary: Legal notices and Oracle copyrights were updated (white and blank space, commas) in tests files for uniformity to meet Oracle requirements.
Reviewed-by: dholmes, iris
Contributed-by: Stanislav Smirnov <stanislav.smirnov@oracle.com>, Vassili Igouchkine <vassili.igouchkine@oracle.com>

8165702: Convert LogFileOutput internal tests to GTest
Reviewed-by: rehn, rprotacio

8165696: Convert gcTraceTime internal tests to GTest
Reviewed-by: rehn, rprotacio

8061219: Implement unit-tests for UL
Reviewed-by: coleenp, mockner, rprotacio