<i18n dev> RFR: 8177819: DateTimeFormatterBuilder zone parsing should recognise DST

[Naoto Sato]

This fix intends to honor the type (std/dst/generic) of parsed zone name for selecting the offset at the overlap. Corresponding CSR has also been drafted.

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Commit messages:
 - 8177819: DateTimeFormatterBuilder zone parsing should recognise DST

Changes: https://git.openjdk.java.net/jdk/pull/6527/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6527&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8177819
  Stats: 112 lines in 5 files changed: 61 ins; 0 del; 51 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6527.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6527/head:pull/6527

PR: https://git.openjdk.java.net/jdk/pull/6527