RFR: 8294985: SSLEngine throws IAE during parsing of X500Principal [v15]

[Kevin Driver]

> Fixes: [JDK-8294985](https://bugs.openjdk.org/browse/JDK-8294985)

Kevin Driver has updated the pull request incrementally with two additional commits since the last revision:

 - fix bug id in test header
 - reworked example into a jtreg test

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/13466/files
  - new: https://git.openjdk.org/jdk/pull/13466/files/cae5e1bc..d4ffde32

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13466&range=14
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13466&range=13-14

  Stats: 204 lines in 1 file changed: 204 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13466.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13466/head:pull/13466

PR: https://git.openjdk.org/jdk/pull/13466