Ed Santiago 420bd16a21 CI: system tests: make random_free_port() parallel-safe ...

...by using a crude port lock-and-reserve mechanism. This is
a small cherrypick from code that has been working in #23275
over dozens of CI runs. Am separating out into a small PR
because it's stable, harmless to serial runs, and will
simplify the eventual review of #23275.

Closes: #23488

Signed-off-by: Ed Santiago <santiago@redhat.com>

2024-08-15 10:04:51 -06:00

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