<i18n dev> RFR: 8287340: Refactor old code using StringTokenizer in locale related code

[Joe Wang]

On Tue, 31 May 2022 17:46:18 GMT, Naoto Sato <naoto at openjdk.org> wrote:

> Refactoring some old code in locale providers. The test case data have also been modified due to:
> - There's a bug in `LocaleProviderAdapter.toLocaleArray()` where it did not handle the case for `no-NO-NY`.
> - `Locale.toLanguageTag()` won't handle legacy Java locales, e.g., `ja_JP_JP` and falls back, so comparing locales using language tags does not work for those locales. Changed to compare with `Locale.toString()` instead.

Marked as reviewed by joehw (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/8960