[jdk17u-dev] RFR: 8317808: HTTP/2 stream cancelImpl may leave subscriber registered [v2]

[Goetz Lindenmaier]

> I backport this for parity with 17.0.17-oracle.

Goetz Lindenmaier has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains five commits:

 - Merge branch 'master' into goetz_backport_8317808
 - Backport 6273ab97dc1a0d3c1f51ba94694d9594dd7593d4
 - Adapt test to missing AutoClosable etc.
 - Parts of 8305847
 - Backport d8291f593762ab270bf05643b87c57578d716242

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Changes: https://git.openjdk.org/jdk17u-dev/pull/3719/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=3719&range=01
  Stats: 36 lines in 5 files changed: 22 ins; 11 del; 3 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/3719.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/3719/head:pull/3719

PR: https://git.openjdk.org/jdk17u-dev/pull/3719