RFR: 8324577: [REDO] - [IMPROVE] OPEN_MAX is no longer the max limit on macOS >= 10.6 for RLIMIT_NOFILE

[Gerard Ziemski]

This is a 3rd attempt of the same fix:

1st one had to be pulled out because of a bug in zsh
2nd one had a workaround for the bug in zsh, but then uncovered an issue in JWDP (JDK-8324668), which was subsequently fixed.

Tested with MACH5 tier1-9 with no unique or new failures on macOS

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Commit messages:
 - Merge remote-tracking branch 'upstream/master' into JDK-8324577
 - use higher RLIMIT_NOFILE limit on macosx

Changes: https://git.openjdk.org/jdk/pull/18821/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18821&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8324577
  Stats: 18 lines in 1 file changed: 9 ins; 0 del; 9 mod
  Patch: https://git.openjdk.org/jdk/pull/18821.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18821/head:pull/18821

PR: https://git.openjdk.org/jdk/pull/18821