[jdk17u-dev] RFR: 8342075: HttpClient: improve HTTP/2 flow control checks [v4]

[Goetz Lindenmaier]

> I backport this for parity with 17.0.17-oracle based on the change in 21.
> 
> src/java.net.http/share/classes/jdk/internal/net/http/Stream.java
> Two trivial resolves due to context.
> 
> src/java.net.http/share/classes/jdk/internal/net/http/WindowUpdateSender.java
> 
> Resolved because 8308310: HttpClient: Avoid logging or locking from within synchronized blocks
> is not in 17.
> 
> src/java.net.http/share/classes/module-info.java
> Omitted, as "8296804: Document HttpClient configuration properties in java.net.http module-info"
> is not in 17.  The CSR for 17 documents that this is dropped.
> 
> Follow ups are on the list of backports I will do.
> Blocking changes all already in 17.
> 
> I had to adapt ConnectionFlowControlTest.java and StreamFlowControlTest.java because HttpClient does not
> implement AutoClosable / shutdownNow() / close() in 17.
> I also amended the @build instructions in StreamFlowControlTest.java.

Goetz Lindenmaier has updated the pull request incrementally with one additional commit since the last revision:

  Test improvements by Aleksey Bakhtin

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

Changes:
  - all: https://git.openjdk.org/jdk17u-dev/pull/3786/files
  - new: https://git.openjdk.org/jdk17u-dev/pull/3786/files/c86d9d24..073bb3d5

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3786&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3786&range=02-03

  Stats: 37 lines in 2 files changed: 17 ins; 0 del; 20 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3786.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3786/head:pull/3786

PR: https://git.openjdk.org/jdk17u-dev/pull/3786