8156226: DiagnosticCommandImpl::invoke throws not very comprehensive message in case if method exists but signature or parameters are wrong
Reviewed-by: mchung, dholmes, dfuchs

8132209: DiagnosticCommandImpl.getNotificationInfo() may expose internal representation
Summary: DiagnosticCommandImpl.getNotificationInfo() may expose internal representation
Reviewed-by: skoivu, fparain, jbachorik

8042901: Allow com.sun.management to be in a different module to java.lang.management
Reviewed-by: mchung, dfuchs, erikj, jbachorik