[v6.x backport] test: remove hidden use of common.PORT in parallel tests #17771
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Backport of #17466
common.hasMultiLocalhost() uses common.PORT under the hood. This is
problematic in parallel tests because another test using port 0 to
get an arbitrary open port may end up getting common.PORT before the
test using common.PORT gets it.
Therefore, change common.PORT to port 0 in common.hasMultiLocalhost().
PR-URL: #17466
Reviewed-By: Luigi Pinca luigipinca@gmail.com
Reviewed-By: Colin Ihrig cjihrig@gmail.com
Reviewed-By: Jon Moss me@jonathanmoss.me
Reviewed-By: James M Snell jasnell@gmail.com
Reviewed-By: Michael Dawson michael_dawson@ca.ibm.com
Reviewed-By: Ruben Bridgewater ruben@bridgewater.de
Checklist
make -j4 test
(UNIX), orvcbuild test
(Windows) passesAffected core subsystem(s)
test