RFR: 8284694: Avoid evaluating SSLAlgorithmConstraints twice [v3]

[Daniel Jeliński]

> During TLS handshake, hundreds of constraints are evaluated to determine which cipher suites are usable. Most of the evaluations are performed using `HandshakeContext#algorithmConstraints` object. By default that object contains a `SSLAlgorithmConstraints` instance wrapping another `SSLAlgorithmConstraints` instance. As a result the constraints defined in `SSLAlgorithmConstraints` are evaluated twice.
> 
> This PR improves the default case; if the user-specified constraints are left at defaults, we use a single `SSLAlgorithmConstraints` instance, and avoid duplicate checks.

Daniel Jeliński has updated the pull request incrementally with two additional commits since the last revision:

 - add more factory methods, update copyright
 - return DEFAULT also when user constraints are null

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8199/files
  - new: https://git.openjdk.java.net/jdk/pull/8199/files/b6e46ae9..e4cc8152

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8199&range=02
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8199&range=01-02

  Stats: 65 lines in 6 files changed: 33 ins; 2 del; 30 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8199.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8199/head:pull/8199

PR: https://git.openjdk.java.net/jdk/pull/8199