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

[Ian Graves]

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.

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Commit messages:
 - Converting jpackage to use Stream.toList()

Changes: https://git.openjdk.java.net/jdk/pull/2997/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2997&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8263545
  Stats: 47 lines in 17 files changed: 1 ins; 3 del; 43 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2997.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2997/head:pull/2997

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