tests: remove common.PORT from cluster worker disconnect, exit and kill
Migrate the following test files away from common.PORT:
- test-cluster-worker-disconnect.js
- test-cluster-worker-exit.js
- test-cluster-worker-kill.js
Ref: https://github.com/nodejs/node/issues/12376
Checklist
-
make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
commit message follows commit guidelines
Affected core subsystem(s)
test