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
Added long-form logging message to three places in code, allowing TraceExceptionsTest.java to pass with compiled code.
Reviewed-by: dholmes, coleenp, lfoltan
The -XX:+TraceExceptions flag has been updated to the unified logging framework, i.e. -Xlog:exceptions. The old flag, because it is product-level, has been aliased to the UL option.
Reviewed-by: dholmes, coleenp, mockner
