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

[Andy Herrick]

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

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Commit messages:
 - JDK-8252870: Finalize (remove "incubator" from) jpackage
 - 8252869 Finalize (remove incubator from) jpackage (implementation)

Changes: https://git.openjdk.java.net/jdk/pull/633/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=633&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8252870
  Stats: 1796 lines in 262 files changed: 723 ins; 732 del; 341 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