RFR: JDK-8263545: Convert jpackage to use Stream.toList() [v3]

[Ian Graves]

On Fri, 19 Mar 2021 01:17:34 GMT, Alexey Semenyuk <asemenyuk at openjdk.org> wrote:

>> Ian Graves has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains two commits:
>> 
>>  - Clarifying type argument and shorting a toArray invocation
>>  - Converting jpackage to use Stream.toList()
>
> Marked as reviewed by asemenyuk (Reviewer).

Ready for sponsoring when you all are.

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PR: https://git.openjdk.java.net/jdk/pull/2997