RFR: 8262389: Use permitted_enctypes if default_tkt_enctypes or default_tgs_enctypes is not present

[Weijun Wang]

When default_tkt_enctypes or default_tgs_enctypes, use the value of permitted_enctypes if it exists.

Please also review the CSR at https://bugs.openjdk.java.net/browse/JDK-8262391 and release note at https://bugs.openjdk.java.net/browse/JDK-8262401.

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Commit messages:
 - 8262389: Use permitted_enctypes if default_tkt_enctypes or default_tgs_enctypes is not present

Changes: https://git.openjdk.java.net/jdk/pull/2729/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2729&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8262389
  Stats: 60 lines in 2 files changed: 60 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2729.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2729/head:pull/2729

PR: https://git.openjdk.java.net/jdk/pull/2729