[jdk17u-dev] 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

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Commit messages:
 - Backport f4b140b4200fc0f49161395501d3dbcba7a79059

Changes: https://git.openjdk.org/jdk17u-dev/pull/2798/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2798&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-dev/pull/2798.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2798/head:pull/2798

PR: https://git.openjdk.org/jdk17u-dev/pull/2798