test: fix flaky test-cluster-dgram-2 #9791
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Checklist
make -j8 test
(UNIX), orvcbuild test nosign
(Windows) passesAffected core subsystem(s)
test cluster
Description of change
There is no guarantee that a dgram packet will be received. The test is
currently written to only send exactly as many dgram packets as required
assuming they are all received. As a result, failures like this may
occur (from CI):
This change has the workers send packets continuously until disconnect.
Ref: https://ci.nodejs.org/job/node-test-commit-arm/6044/nodes=armv7-ubuntu1404/console