RFR: 8331975: Enable case-insensitive check in ccache and keytab entry lookup [v2]

[Weijun Wang]

> Add a new system property to control the name comparison in keytab and ccache entry lookup.

Weijun Wang has updated the pull request incrementally with one additional commit since the last revision:

  enhance test

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Changes:
  - all: https://git.openjdk.org/jdk/pull/19216/files
  - new: https://git.openjdk.org/jdk/pull/19216/files/f6ad0a8c..1263ae13

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19216&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19216&range=00-01

  Stats: 47 lines in 1 file changed: 41 ins; 2 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/19216.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19216/head:pull/19216

PR: https://git.openjdk.org/jdk/pull/19216