test: improve test-cluster-net-listen-ipv6only-* tests
- Replace Map with Array
-
Add additional checks that code/test work as expected(Failed on Windows so I took it out.) - Use Promise.all() in place of countdown
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines