It is increasingly difficult to run tests outside the jtreg test execution environment, and so it is increasingly desirable to be able to attach a debugger to a test being executed by jtreg.

Although it is possible to use -vmoptions to specify options for attaching a debugger, vmoptions also get passed to any initial JVMs created by jtreg to query VM properties. We need a way of specifying options just to those JVMs of interest.