test: cover dgram socket close during cluster bind

When a non-exclusive dgram socket is bound from a cluster
worker, it attempts to get a handle from the cluster module.
This commit adds coverage for the case where the socket is
closed while querying the cluster module for a handle.

PR-URL: https://github.com/nodejs/node/pull/11292


Reviewed-By: James M Snell <jasnell@gmail.com>