This commit adds missing debug log statements for exceptions
that occur during ticket validation. I thought these
get logged somewhere else in authentication chain
but even after enabling trace logs I could not see them
logged. As the Kerberos exception messages are cryptic
adding full stack trace would help debugging faster.

This commit adds missing debug log statements for exceptions
that occur during ticket validation. I thought these
get logged somewhere else in authentication chain
but even after enabling trace logs I could not see them
logged. As the Kerberos exception messages are cryptic
adding full stack trace would help debugging faster.

…listeners

* elastic/master: (58 commits)
  [ML] Partition-wise maximum scores (elastic#32748)
  [DOCS] XContentBuilder#bytes method removed, using BytesReference.bytes(docBuilder) (elastic#32771)
  HLRC: migration get assistance API (elastic#32744)
  Add a task to run forbiddenapis using cli (elastic#32076)
  [Kerberos] Add debug log statement for exceptions (elastic#32663)
  Make x-pack core pull transport-nio (elastic#32757)
  Painless: Clean Up Whitelist Names (elastic#32791)
  Cat apis: Fix index creation time to use strict date format (elastic#32510)
  Clear Job#finished_time when it is opened (elastic#32605) (elastic#32755)
  Test: Only sniff host metadata for node_selectors (elastic#32750)
  Update scripted metric docs to use `state` variable (elastic#32695)
  Painless: Clean up PainlessCast (elastic#32754)
  [TEST] Certificate NONE not allowed in FIPS JVM (elastic#32753)
  [ML] Refactor ProcessCtrl into Autodetect and Normalizer builders (elastic#32720)
  Access build tools resources (elastic#32201)
  Tests: Disable rolling upgrade tests with system key on fips JVM (elastic#32775)
  HLRC: Ban LoggingDeprecationHandler (elastic#32756)
  Fix test reproducability in AbstractBuilderTestCase setup (elastic#32403)
  Only require java<version>_home env var if needed
  Tests: Muted ScriptDocValuesDatesTests.testJodaTimeBwc
  ...