RFR: 8349533: Refactor validator tests shell files to java [v3]

[Mikhail Yankelevich]

> Changed shell files to be java tests:
> * ./validator/certreplace.sh
> * ./validator/samedn.sh

Mikhail Yankelevich has updated the pull request incrementally with one additional commit since the last revision:

  keyStore store and cleanup

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Changes:
  - all: https://git.openjdk.org/jdk/pull/23727/files
  - new: https://git.openjdk.org/jdk/pull/23727/files/f333ddff..9ee62904

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23727&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23727&range=01-02

  Stats: 59 lines in 1 file changed: 11 ins; 20 del; 28 mod
  Patch: https://git.openjdk.org/jdk/pull/23727.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23727/head:pull/23727

PR: https://git.openjdk.org/jdk/pull/23727