8146435: [TESTBUG] Logging tests are failing intermittently on windows when executed by JPRT
Summary: Improved robustness of UL tests by removing reliance on "java -version" and replacing with explicit code to trigger logging in all environments
Reviewed-by: dholmes, iklam, mockner

8141564: Convert TraceItables and PrintVtables to Unified Logging
Summary: The former -XX:+TraceItables and +PrintVtables flags have been converted to UL options -Xlog:itables=trace and vtables=trace
Reviewed-by: acorn, coleenp, dholmes