[jdk17u] RFR: 8296410: HttpClient throws java.io.IOException: no statuscode in response for HTTP2

[Alexey Bakhtin]

The backport is almost clean.

manual update of the copyright year for Stream.java
manual merge of one-line change in the Http2TestServer.java file. Caused by difference in JDK-8295944 implementation for JDK17 and JDK21
All java/net/httpclient JTREG tests passed

-------------

Commit messages:
 - Backport f4b140b4200fc0f49161395501d3dbcba7a79059

Changes: https://git.openjdk.org/jdk17u/pull/399/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u&pr=399&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8296410
  Stats: 431 lines in 5 files changed: 389 ins; 14 del; 28 mod
  Patch: https://git.openjdk.org/jdk17u/pull/399.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u.git pull/399/head:pull/399

PR: https://git.openjdk.org/jdk17u/pull/399