[jdk11u-dev] RFR: 8242330: Arrays should be cloned in several JAAS Callback classes

[Yuri Nesterenko]

Backport of the fix is clean for 11u in everything but copyright dates.
CSR copy is filed as [JDK-8317297](https://bugs.openjdk.org/browse/JDK-8317297).

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Commit messages:
 - Backport 8cd9241448f818b5e307d408ac4395b518791096

Changes: https://git.openjdk.org/jdk11u-dev/pull/2157/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2157&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8242330
  Stats: 132 lines in 3 files changed: 107 ins; 0 del; 25 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2157.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2157/head:pull/2157

PR: https://git.openjdk.org/jdk11u-dev/pull/2157