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

[Ian Graves]

On Thu, 18 Mar 2021 19:43:10 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> This converts jpackage to use `Stream.toList()` instead of `Stream.collect(Collectors.toList())`. One piece of code was modified to not mutate a list in addition to one test that used a mutating sort on a list. The rest of the changes are simple substitutions.
>
> @igraves as a "best practice" try to avoid doing a force-push to a branch with an active code review. It makes it hard for reviewers to see what has changed. If you need to merge changes from master, use "git merge master" instead.
> 
> @alexeysemenyukoracle @sashamatveev Can you re-review this so Ian can integrate it?

@kevinrushforth Understood, thanks!

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