RFR: JDK-8252870: Finalize (remove "incubator" from) jpackage [v3]

[Andy Herrick]

> JDK-8252870: Finalize (remove "incubator" from) jpackage

Andy Herrick has updated the pull request with a new target base due to a merge or a rebase. The pull request now
contains four commits:

 - Merge branch 'master' into JDK-8252870
 - JDK-8252870: Finalize (remove "incubator" from) jpackage
     - reverting two auto-generated files, and changing module-info to "@since 16"
 - JDK-8252870: Finalize (remove "incubator" from) jpackage
   Merge branch 'finalize' into JDK-8252870
 - 8252869 Finalize (remove incubator from) jpackage (implementation)

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Changes: https://git.openjdk.java.net/jdk/pull/633/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=633&range=02
  Stats: 1733 lines in 259 files changed: 692 ins; 701 del; 340 mod
  Patch: https://git.openjdk.java.net/jdk/pull/633.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/633/head:pull/633

PR: https://git.openjdk.java.net/jdk/pull/633