[jdk11u-dev] RFR: 8274205: Handle KDC_ERR_SVC_UNAVAILABLE error code from KDC

[Goetz Lindenmaier]

I backport this for parity with 11.0.20-oracle.

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Commit messages:
 - Backport 5ba0d09fe47439880daf913f4ff0b978ed9c1ac6

Changes: https://git.openjdk.org/jdk11u-dev/pull/1935/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=1935&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8274205
  Stats: 88 lines in 3 files changed: 86 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/1935.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/1935/head:pull/1935

PR: https://git.openjdk.org/jdk11u-dev/pull/1935