RFR: 8250950: Allow per-user and system wide configuration of a jpackaged app [v2]

[Alexey Semenyuk]

> 8250950: Allow per-user and system wide configuration of a jpackaged app

Alexey Semenyuk has updated the pull request incrementally with one additional commit since the last revision:

  Add TKit.createDirectories() method that will delete created nonexistent directories.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/9025/files
  - new: https://git.openjdk.java.net/jdk/pull/9025/files/af2708b4..1f512ff1

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=9025&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=9025&range=00-01

  Stats: 38 lines in 2 files changed: 32 ins; 1 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/9025.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/9025/head:pull/9025

PR: https://git.openjdk.java.net/jdk/pull/9025