RFR: 8282279: Interpret case-insensitive string locale independently

[Xue-Lei Andrew Fan]

The String.toUpperCase() or String.toLowerCase() method is locale sensitive, and may produce unexpected results if used for strings that are intended to be interpreted locale independently.  The use of the two methods had been cleaned before, but there are a few new introduced laterly.

See https://www.ivi.co/java/2011/07/07/4878.html for examples.

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Commit messages:
 - 8282279: Interpret case-insensitive string locale independently

Changes: https://git.openjdk.java.net/jdk/pull/7583/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7583&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282279
  Stats: 18 lines in 5 files changed: 5 ins; 0 del; 13 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7583.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7583/head:pull/7583

PR: https://git.openjdk.java.net/jdk/pull/7583