8021003: java/util/logging/Logger/getGlobal/TestGetGlobalConcurrent.java fails intermittently
8019945: test/java/util/logging/LogManagerInstanceTest.java failing intermittently
Summary: This fix untangles the class initialization of Logger and LogManager, and also cleans up the relationship between LogManager, LoggerContext, and Logger, which were at the root cause of some intermittent test failures.
Reviewed-by: mchung, martin, plevart

Summary: Use generics, suppress warnings where appropriate, remove unused imports, etc.
Reviewed-by: lancea, chegar

Reviewed-by: alanb, dsamersoff

Summary: Check against the list of loggers added since the test begins to run
Reviewed-by: dcubed