RFR: JDK-8291509 Minor cleanup could be done in sun.security [v8]

[Mark Powers]

> https://bugs.openjdk.org/browse/JDK-8291509

Mark Powers has updated the pull request incrementally with one additional commit since the last revision:

  final comments from Max

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Changes:
  - all: https://git.openjdk.org/jdk/pull/9972/files
  - new: https://git.openjdk.org/jdk/pull/9972/files/800b100f..6e2c308b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9972&range=07
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9972&range=06-07

  Stats: 256 lines in 9 files changed: 10 ins; 24 del; 222 mod
  Patch: https://git.openjdk.org/jdk/pull/9972.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/9972/head:pull/9972

PR: https://git.openjdk.org/jdk/pull/9972