RFR: 8327818: Implement Kerberos debug with sun.security.util.Debug

[Weijun Wang]

Change `Krb5LoginModule` debugging to use `sun.security.util.Debug`.

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Commit messages:
 - the fix

Changes: https://git.openjdk.org/jdk/pull/18199/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18199&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327818
  Stats: 191 lines in 3 files changed: 135 ins; 6 del; 50 mod
  Patch: https://git.openjdk.org/jdk/pull/18199.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18199/head:pull/18199

PR: https://git.openjdk.org/jdk/pull/18199