hg: jigsaw/jigsaw/jdk: jpkg: Added --fast option

[Dalibor Topic]

The reason for adding this option is to expose some useful functionality
Mark introduced to jpkg earlier through a simple command line switch.

When you use --fast, the compression level used with tools that
packaging work is being delegated to is set to fastest, rather then best.

Useful during development of jdk packages, as running pack200, etc. can
take a bit of time otherwise.

cheers,
dalibor topic

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