RFR: 8367344: Better error message when decryption of AP-REQ fails because of kvno mismatch

[Weijun Wang]

For interoperability, AP-REQ decryption uses the key with the highest kvno in the keytab if no exact match is found. If decryption fails, a normal "checksum failed" error is reported, which may hide the real cause that the wrong key is used. This code change throws a KRB_AP_ERR_BADKEYVER error in this case.

The change is only made in AP-REQ decryption to minimize impact. A previous test is enhanced to cover the case.

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Commit messages:
 - the fix

Changes: https://git.openjdk.org/jdk/pull/27298/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27298&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367344
  Stats: 60 lines in 3 files changed: 44 ins; 0 del; 16 mod
  Patch: https://git.openjdk.org/jdk/pull/27298.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27298/head:pull/27298

PR: https://git.openjdk.org/jdk/pull/27298