RFR: JDK-8166596: TLS support for the EdDSA signature algorithm [v5]

[Jamil Nimeh]

> Hello all,
> This change brings in support for certificates with EdDSA keys (both Ed25519 and Ed448) allowing those signature algorithms to be used both on the certificates themselves and used during the handshaking process for messages like CertificateVerify, ServerKeyExchange and so forth.

Jamil Nimeh has updated the pull request incrementally with one additional commit since the last revision:

  Applied code review comments

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1197/files
  - new: https://git.openjdk.java.net/jdk/pull/1197/files/58651fc5..9f9164a5

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1197&range=04
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1197&range=03-04

  Stats: 31 lines in 2 files changed: 10 ins; 12 del; 9 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1197.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1197/head:pull/1197

PR: https://git.openjdk.java.net/jdk/pull/1197