8301255: Http2Connection may send too many GOAWAY frames

[GoeLin]

I backport this for parity with 17.0.17-oracle.

Omitted copyrights as files already have younger ones.

Resolved two chunks in Http2Connection because later change
"8328286: Enhance HTTP client" was already backported.

In shutdown(Throwable) that change added line
cause.compareAndSet(null, t);
messing up the context.
Also, it removed the line
if (initialCause == null) this.cause = t;
this change intends to edit, so I omitted this edit.

In protocolError(int, String) "8328286: Enhance HTTP client" added some
code that needs to go into the if() added by this change.
Resolved. so that it is the same as in 21.

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Progress

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• JDK-8301255 needs maintainer approval

Issue

• JDK-8301255: Http2Connection may send too many GOAWAY frames (Bug - P4)

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[bridgekeeper]

👋 Welcome back goetz! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[mlbridge]

Webrevs

• 00: Full (c1c2e424)

[GoeLin]

GAH failure: download failed. Unrelated.
jdk-17.0.17/fastdebug/lib/modules: truncated gzip input