8246325: Add DRYRUN facility to SetupExecute

[magicus]

With DRYRUN := true, the actual command line will not be executed, but all other steps are done, to facilitate debugging.

This PR has effects on some closed Oracle code, hence the changes in the mac bundle path logic.

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Issue

• JDK-8246325: Add DRYRUN facility to SetupExecute (Enhancement - P4)

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