RFR: 8297531: sun/security/krb5/MicroTime.java fails with "Exception: What? only 100 musec precision?"

[Weijun Wang]

Loosen the check; the modified test is sufficient to demonstrate sub-millisecond precision.

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Commit messages:
 - another fix
 - the fix

Changes: https://git.openjdk.org/jdk/pull/23867/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23867&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8297531
  Stats: 4 lines in 1 file changed: 0 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/23867.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23867/head:pull/23867

PR: https://git.openjdk.org/jdk/pull/23867