RFR: 8301379: Verify TLS_ECDH_* cipher suites cannot be negotiated [v5]

[Matthew Donovan]

> This PR implements a test to verify that Java will not negotiate TLS connections when one side of the connection requests disabled cipher suites.

Matthew Donovan has updated the pull request incrementally with one additional commit since the last revision:

  added clarifying comment

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Changes:
  - all: https://git.openjdk.org/jdk/pull/14316/files
  - new: https://git.openjdk.org/jdk/pull/14316/files/d66a7c2f..948d2d61

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14316&range=04
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14316&range=03-04

  Stats: 9 lines in 1 file changed: 9 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/14316.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14316/head:pull/14316

PR: https://git.openjdk.org/jdk/pull/14316