RFR: 8350601: Miscellaneous updates to jpackage test lib [v3]

[Alexey Semenyuk]

On Mon, 24 Feb 2025 22:57:21 GMT, Alexander Matveev <almatvee at openjdk.org> wrote:

> This one is confusing. It will evaluate to true if both != null

Correct. They both shouldn't be `true`. One of them must be `true`, and another one must be `false`.

> Did you mean "&&" instead of "=="?

No. I meant `==` :)

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PR Review Comment: https://git.openjdk.org/jdk/pull/23754#discussion_r1968649331