test: remove known_issues/test-cluster-bind-privileged-port
The test was added to check for a bug in macOS Mojave, but it turns out the issue is a macOS feature, not a bug.
Refs: https://github.com/nodejs/node/issues/21679#issuecomment-456589386 Fixes: https://github.com/nodejs/node/issues/21679
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
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