[jdk21u-dev] RFR: 8349534: Refactor jdk/sun/security/krb5/runNameEquals.sh to java test

[Goetz Lindenmaier]

I backport this for parity with 21.0.10-oracle

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Commit messages:
 - Backport 0e223f1456c14efdb423595bee3444d5e26db7c6

Changes: https://git.openjdk.org/jdk21u-dev/pull/2302/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2302&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8349534
  Stats: 173 lines in 2 files changed: 18 ins; 137 del; 18 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2302.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2302/head:pull/2302

PR: https://git.openjdk.org/jdk21u-dev/pull/2302