<i18n dev> RFR: JDK-8276302: Locale.filterTags methods ignore actual weight when matching "*" (as if it is 1)

[Daniel Le]

Locale.filterTags methods ignore actual weight when matching "*" (as if
it is 1) because LocaleMatcher.{filterBasic,filterExtended} do so.

Fix the bug and add regression test cases for it as well as existing
behavior.

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Commit messages:
 - Locale.filterTags must respect the weight of "*"

Changes: https://git.openjdk.java.net/jdk/pull/6789/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=6789&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8276302
  Stats: 121 lines in 2 files changed: 59 ins; 54 del; 8 mod
  Patch: https://git.openjdk.java.net/jdk/pull/6789.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/6789/head:pull/6789

PR: https://git.openjdk.java.net/jdk/pull/6789