[jdk17u-dev] RFR: 8267517: async logging for stdout and stderr

[Xin Liu]

This PR backports JDK-8267517 to jdk17u. -Xlog:async will route LogOutput stdout/stderr to the asynchronous logging queue like ordinary log files. The reason we do is that some Java application outputs logs to stdout/stderr and redirect them to files then. 

This is **NOT** a clean backport. It's because jdk17u is missing a few patches, such as JDK-8273471, JDK-8269004. I tried to backport them beforehand, but they both have dependencies.  I manually resolve a couple of conflicts. 

We have verified patch like how we verified for jdk-tip. We output verbose gclog to stdout `-Xlog:gc=trace:stdout` and leverage software flow control to pause our console(C-s). Java threads don't be blocked with '-Xlog:async'. Without this patch, kernel puts Java threads which require GC to 'sleep' state when unified log is blocked.

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Commit messages:
 - Backport 7aff03aee1a5cd70638d8bbafeb7765bc7beea45

Changes: https://git.openjdk.org/jdk17u-dev/pull/1555/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1555&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8267517
  Stats: 124 lines in 7 files changed: 94 ins; 6 del; 24 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1555.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1555/head:pull/1555

PR: https://git.openjdk.org/jdk17u-dev/pull/1555