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

[Steve Drach]

>> I think I’m getting distracted here, not focusing on getting tests created.  Is it okay to move on?
> 
> Please move on. If you think anything is strange, just send me all related files.
> 
> One last request about the SSLException, can you still generate the full debug output for jar signing with an empty cacerts? I think just adding a -debug option will print out a full stack trace showing where the exception is thrown.

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