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

[Kevin Rushforth]

On Sun, 14 Mar 2021 18:22:50 GMT, Ian Graves <igraves 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?

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