RFR: 8284067: jpackage'd launcher reports non-zero exit codes with error prompt

[Alexander Matveev]

On Thu, 31 Mar 2022 20:08:13 GMT, Alexey Semenyuk <asemenyuk at openjdk.org> wrote:

> Add missing `exit(exitCode)` call.
> Add relevant unit test.

Marked as reviewed by almatvee (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/8064