RFR: JDK-8291509 Minor cleanup could be done in sun.security [v5]

[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:

  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/5e354828..8ad0aa97

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=9972&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=9972&range=03-04

  Stats: 94 lines in 23 files changed: 10 ins; 19 del; 65 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