<i18n dev> RFR: 8285844: TimeZone.getTimeZone(ZoneOffset) does not work for all ZoneOffsets and returns GMT unexpected [v5]

[Naoto Sato]

> This is to extend the `Custom ID`s in `java.util.TimeZone` class to support second-level resolution, enabling round trips with `java.time.ZoneOffset`s. Corresponding CSR is also being drafted.

Naoto Sato has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains six additional commits since the last revision:

 - Disallow `UTC` -> `GMT`
 - Merge branch 'master' into JDK-8285844
 - Minor fixup
 - Allowed round-trips for offset-style ZoneIds.
 - Fixed offsets in milliseconds, added test variations, refined Custom ID definitions
 - 8285844: TimeZone.getTimeZone(ZoneOffset) does not work for all ZoneOffsets and returns GMT unexpected

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8606/files
  - new: https://git.openjdk.java.net/jdk/pull/8606/files/9722decd..11150ac5

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8606&range=04
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8606&range=03-04

  Stats: 8626 lines in 248 files changed: 4866 ins; 2323 del; 1437 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8606.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8606/head:pull/8606

PR: https://git.openjdk.java.net/jdk/pull/8606