test: dynamic port in cluster worker dgram
Remove common.PORT from test-cluster-dgram-1 and test-cluster-dgram-2, in order to eliminate the possibility of port collision.
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