RFR: 8336935: Test sun/security/krb5/auto/RealmSpecificValues.java fails: java.lang.RuntimeException: Should not reach here

[Weijun Wang]

The test sets system properties. Should run in `othervm`.

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Commit messages:
 - the fix

Changes: https://git.openjdk.org/jdk/pull/20284/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20284&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8336935
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/20284.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/20284/head:pull/20284

PR: https://git.openjdk.org/jdk/pull/20284