RFR - 8132734: java.util.jar.* changes to support multi-release jar files

[Steve Drach]

>>>> The current test directory contains binary jar files. In fact in all the test directories, there are 52 binary .jar files.
>>> I know but we need to work to remove those.
>> 
>> I figured that might be the response, but thought it was worth the try ;-)
>> 
> 
> A reasonable way forward is to go with pre-baked jar files (it’s not making the current situation particular any worse) then lets try and clear up this aspect in a later push, hopefully using a common mechanism that can be used by all such tests that need to construct jar files.

+1 on the common mechanism.  For building jars and other common tasks.

It would also be nice to have some form of test sequencing or other way to indicate that multiple tests depend on a common set of artifacts and that set only needs to be created once.