RFR: 8257497: Key identifier compliance issue

[Hai-May Chao]

This change is made for compliance with RFC 5280 section 4.2.1.1 for Authority Key Identifier extension.

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Commit messages:
 - 8257497: Key identifier compliance issue

Changes: https://git.openjdk.java.net/jdk/pull/2343/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=2343&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8257497
  Stats: 32 lines in 2 files changed: 22 ins; 0 del; 10 mod
  Patch: https://git.openjdk.java.net/jdk/pull/2343.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/2343/head:pull/2343

PR: https://git.openjdk.java.net/jdk/pull/2343