RFR: JDK-8307794 Test for HSS/LMS Signature Verification [v3]

[Mark Powers]

> https://bugs.openjdk.org/browse/JDK-8307794

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

  Ferenc: comments 1 and 2

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13940/files
  - new: https://git.openjdk.org/jdk/pull/13940/files/7598bc74..eaace224

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13940&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13940&range=01-02

  Stats: 1479 lines in 1 file changed: 179 ins; 664 del; 636 mod
  Patch: https://git.openjdk.org/jdk/pull/13940.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13940/head:pull/13940

PR: https://git.openjdk.org/jdk/pull/13940