RFR: JDK-8307794 Test for HSS/LMS Signature Verification [v7]

[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:

  Sean's additional comments take 2

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13940/files
  - new: https://git.openjdk.org/jdk/pull/13940/files/3f5e8272..c72fada8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13940&range=06
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13940&range=05-06

  Stats: 239 lines in 3 files changed: 104 ins; 32 del; 103 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