RFR: 8371887: HttpClient: SSLParameters with no protocols configured disable HTTP2+ support

[Daniel Jeliński]

When checking for supported TLS versions, use SSLContext default parameters if the provided SSLParameters have no protocols configured.

This fixes an issue where using SSLParameters with no protocols disabled the use of HTTP2 and HTTP3, even when these protocols were supported and enabled in the SSLContext.

Modified the existing tests to additionally cover the case of empty SSLParameters. All tests continue to pass.

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Commit messages:
 - Do not require protocols in SSLParameters

Changes: https://git.openjdk.org/jdk/pull/28480/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=28480&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8371887
  Stats: 122 lines in 7 files changed: 70 ins; 39 del; 13 mod
  Patch: https://git.openjdk.org/jdk/pull/28480.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28480/head:pull/28480

PR: https://git.openjdk.org/jdk/pull/28480