test: dynamic port in test cluster disconnect
Removed common.PORT from test-cluster-disconnect to eliminate the possibility that a dynamic port used in another test will collide with common.PORT.
Refs: https://github.com/nodejs/node/issues/12376
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines
Affected core subsystem(s)
test